UPDATE: 25 July 2016

Well, the Endomorph and the Larry didn't last long. After just a couple months riding my "new" Pugsley back in 2013 they were quickly replaced with a
Nate and a
Knard, both far superior tires for real riding around here, especially by comparison. The Endomorph was, in truth, a mostly terrible tire in nearly all conditions, and the Larry wasn't much better, being among the sketchiest front tires I've ever ridden, most notably in snow where it often wandered this way or that without warning, as if it really did have a mind of its own. The Nate and the Knard on the other hand are both exceptionally trail-worthy tires and, having ridden them for the last couple-three years, in all four seasons, and every condition imaginable, I feel confident in recommending them.
For what it's worth, the Endomorph is now mounted on my Dirtuni mountain unicycle, where it excels as a high volume, low pressure wheel for this super capable rig. The Larry should be in the trash, but it's not. It's hanging from the ceiling in the garage with all the other back-stock take-off tires that I will probably never use.

The hefty, stock Pugsley fork has been replaced with a carbon
Fatback fork, which saved a few ounces, maybe pounds, but required
waaay too much effort to upgrade, something I should have paid attention to before making the deal to buy this fancy fork from a friend. Had to re-lace and re-dish the entire front wheel because the Fatback is non-offset.
And had to spacer the front brake rotor because the brake bosses on the Fatback fork are for front-standard brake mounts (duh) and the Surly wheels are using rear hubs front and rear, a difference of about 2-3mm. Fortunately, presta washers are more-or-less exactly the spacing I needed to get everything to line up, so I mounted one behind each bolt on the rotor and: voila! Worked like a charm.
The
Surly rack has
mostly been unmounted for years. Not for any other reason than I've had little need to install it. It's a lovely rack, beefy and well made, but I haven't needed to carry much on my rides the last three years that I haven't been able to carry on my back. And the rack as-is is not much good as a fender. I cut up an old waterbottle and modded my own fatbike fender a season or two ago, and it works just fine; keeps the mud off my back, which is about all I ever ask of a good fender.
Also, about a year ago I replaced the flat alloy Salsa MotoAce bar with the big sweep with a 15mm riser carbon Easton Monkey Lite bar with a less radical sweep that I like a whole lot better. Saved a couple ounces here, too, I guess. Drip-dried, the Pugs now weighs-in at 33.5 pounds.
Anyway, bottom-line: I still love my Pugs and I ride it a lot. It takes a ton of abuse and never seems to complain. It just goes and goes. Almost anywhere, in almost any conditions.
UPDATE: 04 October 2016
The opportunity presented itself recently to acquire for a
very good price a second Pugsley (and a fourth Surly), a gently used (former rental) Park-Tool-blue model in a size befitting our 11-year-old daughter.
Needless to say, I did not turn away from this opportunity, and therefore soon took possession of said bike.
We are all quite stoked.
A buddy of mine knocked-off some rad classic Surly decals, from Surly's "Eat less dirt" era. I've affixed a set of black ones to the downtube of my Pugsley. I think they look awesome!
Between my last update and now, I've replaced the Pugsley's old-school, narrow handlebars. Wider is better, so now my controls are set at a comfortable, modern 725mm which matches the front-end setup I'm running on a bunch of my other bikes. I put a Thomson layback post on the bike not too long ago too, just to make things a little more comfortable for my bulk in the cockpit. I'm digging it.
Oh, and there's also now a Salsa flip-off quick-release lever on the seatpost. I ride most of my other go-to bikes with dropper posts these days, and it was getting to be really hard switching back to the Pugs without one. Rather than install a new dropper and lose the comfy position that the layback post has me in, I decided to just put a QR on so I could manually lower my seat for the downhills. It's working out okay. It takes a couple extra seconds on both ends, but I'm never going anywhere so urgently on the Pugs that I don't have the time to stop and do this whenever I need to. I put a tiny little silver scratch in the Thomson's black anno finish so I know exactly what height to put the saddle at when I raise it back up. I'm kinda smart like that sometimes.
Had to replace the giant Pugsley bottom bracket prior to this winter season. The old one finally gave up the ghost, was almost fully seized, having been through a thousand iterations of being rid hard and put away wet. Yuck! Fortunately, you can still get new parts for the Pugs like the Sram Howitzer bottom bracket. It wasn't cheap, but Amazon had it, and it bolted right on easy-peasy and seems to be working fine. So yay!
Lastly, I'm now running 3.8 Nates front and rear. For the variable condition winter riding (mud, snow, ice, dry dirt, all in the same ride sometimes) that we get around here these days I've decided this is the best setup yet... They dig in for solid traction, shed any kind of sticky shit quickly without clogging,
and provide relatively predictable control even in the slop. Not bad, Nate. Not bad at all.