Internet
UPDATED: AMG EZ Search v2.0
AMG EZ Search v2.0 will use the tags of the selected or playing iTunes track as the basis for a Song/Artist/Album search at the allmusic website. This version accounts for changes in the AMG site's search mechanism, can parse the stream title of a radio stream for tags if available.
NEW: Search YouTube
Search YouTube will use the Song Name and Artist of the selected or playing track as the basis for a search on YouTube.
I'm surprised I never had a need of this before, but I was looking for a clip from an old Dave Edmunds documentary on his sessions for the "Repeat When Necessary" album. There's a clip of Albert Lee doing solo stuff on "Sweet Little Lisa" that I wanted to check out. The script makes searching from iTunes a tad easier.
UPDATED: Search Wikipedia v2.2
I have been doing a lot of listening to radio streams in iTunes recently. And because of the "surprise" factor inherent in radio listening, an artist will often be played in a stream that I'm curious about. A good provider will format the current stream title to the somewhat standard format of Artist - Song Name which will be scrolled in the the iTunes display while the stream is, er, streaming. Search Wikipedia v2.2 can now detect if a stream is playing, and, if the current stream title is formatted correctly, search Wikipedia using the artist portion of the title. Of course, otherwise, Search Wikipedia will use the playing or selected track's tags as the basis for a Wikipedia article search.
Gracenote Search MIA?
I've never known Gracenote (CDDB) to be down for maintenance, so it's unusual to see a 404 when going to the Gracenote search page. What's up with that?
UPDATED: Current Track to Twitter v2.0
Not necessarily to commemorate the opening of Chirp: Current Track to Twitter v2.0 will tweet information about the currently playing track to your Twitter account, either automatically every time a new track starts or manually with a click of its Dock icon. This latest version is pretty much just a maintenance update since it was last updated in 2007. (See the screenshot I've included on the entry page. "Updating live every two minutes" and "What you and your friends are doing" sure bring back memories.)
UPDATED: CDDB Safari Kit v3.1
These two AppleScripts, "CDDB Safari" and "CDDB Tracks to iTunes via Safari", assist in finding and retrieving Album track information, Album, Artist, and Year from Gracenote's CDDB website using Apple's Safari browser. CDDB Safari Kit v3.1 addresses some minor changes in Gracenote's page formatting.
NEW: Search Amazon UK MP3
Search Amazon UK MP3 uses terms from the selected iTunes track as the basis for a search of the Amazon UK's MP3 site.
UPDATED: eMusic Search v2.0
Added a "Similar to: Artist" option to eMusic Search v2.0. Also runs as universal binary and has some minor performance enhancements.