Sony DPS-V77 - awesome FX box which can be had for ~$2-300. Listed at like $1300 when it came out. Awesome verbs, distrotion, pitch modulators.
MSH-1O, MSH-1C -
http://www.naiant.com. These little mics (omni, cardiod, respectively) sound really good, and you can buy a handful of them for $100.
Stedman metal popfilter - Works well, durable, cleanable.
Intellitouch tuner - The white one without the backlit display is only $25 and gets used all the time. Works off vibrations, not sound, so there's no more "can you stop playing because I'm trying to tune my guitar"
Boss TU-2 tuner - Fastest tuner on the planet for electric instruments. Solid.