Sennheiser RS 180 Lossless Digital Wireless Headphones (~$330)

These things are so wonderful, I own two of them: one for my computer and one for my TV. I waited months for them to be released - before then, lossless wireless couldn't be bought for any amount of money. Their main attributes are:

• Lossless digital - not analog, not lossy compressed digital (unfortunately, their input is analog - as far as I can tell, digital inputs can't be bought for money)
• Open-ear - comfortable to wear for hours (warning: leaks sound if others are present in the room, not the best idea for cubicle headphones)
• Sounds amazing (I am not an "audiophile" but I know quality when I hear it)
• Powered by NiMH AAAs, recharged by contacts in the cradle so you don't have to take them out (I swapped the included batteries for low-self-discharge Eneloop brand batteries, which have higher capacity - it's been years and I haven't had to mess with them since)

Aside from portability (they aren't), their only downside is that they appear to spam the 2.4 GHz spectrum fairly heavily; my iPhone and iPad have occasionally had trouble connecting to wifi while I'm wearing the headphones (I don't yet have a 5 GHz router for the iPad). This doesn't bother me because my computer and consoles are all connected via Ethernet cables (I had to string one 50-foot cable through my apartment, but it was worth it).