I just found out about this amazing feature - it uses the Gracenote sample wave hash database and IDs the track for you. It's the same database that Sony Ericsson's TrackID service uses.
To use it, load up a track in Winamp (I have Winamp Pro - not sure if this feature also exists in the free Winamp - but that's what keygens are for - AOL won't be hurt, I promise ;) Right-click the file in the playlist and select "File Info" (or use the Alt-3 keyboard shortcut). Click the Auto-Tag button.
Confirm the track online, as this isn't always 100% accurate.
This should be a staple in any music geek's toolbelt.
I also think this should either be stickied or added to the FAQ, beside the tips on track ID'ing (eg. searching for heard lyrics fragments) before posting an ID request here.
