2007
Headphones: In addition to my SR325i and K701, I threw a W5000 and K1000 into my collection, and traded my E500 for a pair of triple.fi. The Sony MDR-CD900ST (pretty version of the 7506) rejoined as well.
Amps: Sold both my Gilmore Lite and HeadFive for a Mapletree HD150.
DAC: Went from an Echo Indigo soundcard to some cheap chinese stuff, and then to the DA100.
Source: I'm still stuck with my laptop, and a cheap DVD player...
Plans
This totally depends on what happens next year, and where I'm moving after I graduate. I'm saving up for a Rega Saturn, which I might get in a year or two. Most likely the Pico will replace my amp and DAC, since I like Justin's stuff.
I'm also looking at amps, namely Almarro's A205, Rogue Audio's Cronus and the FirstWatt F1 for the K1K. I'm still at a loss for a preamp for the F1... maybe a GSX. Or maybe more stuff from Rogue Audio. (I really, really like the Cronus.)
I most likely will be pressured from the parents to get speakers (they don't like headphones). At that point, I'll have to start my research on speaker amps, seeing if any of the above can work well with both speakers and the K1K. And the speakers themselves, of course.
Right now, I'm looking at the Pico and getting my K701s recabled. I like the K701s, and can only use the K1K sparingly at the moment.
2006 was a year of experimentation with headphones. In 2007 I decided to be more strict with my spending, making long term changes. I'm hoping 2008/9 will be the time when I can finally settle for a really long-term setup.