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O rings in the HPOP, a new EGR valve assembly, replaced the temp gauge sensor and wiring harness on the transmission, and serviced the transmission. The HPOP and EGR stuff was under warranty, so I payed the $100 on that, the transmission stuff ended up costing about $575.
The truck runs and drives great and pulls really well, too. I don't think it's getting quite the mileage it could (daily driving around the farm without a trailer runs 13-14, highway's around 16 (unloaded) - maybe 17 if I drive 60'ish). In hopes of increasing mileage, I'm seriously considering a mild tune and/or exhaust mods, but it runs so well and has been so completely reliable (except for the HPOP issues) that I'm kind of afraid to mess with a good thing. I really like it, and I'm thinking that I'll be driving this one awhile (the 2 years I've already had it is about as long as usually keep one), so reliability and longevity are really important to me.
Therefore watch your mods if you value your warranty.