Several single versions of Coldplay's "Talk" have been released to date, most which contain live tracks as B-sides.
However, you may not know it, but several club mixes of "Talk" have been made as well, and the track is fast becoming Coldplay's first real club hit. (A remix of "Clocks" also got some play in clubs but not to this extent.) While at first glance this may seem surprising it actually makes perfect sense. You see, the melody of "Talk" is actually sampled from Kraftwerk's 1983 electronic single "Computerlove".
The remixes of "Talk" are official mixes and have been promoted to clubs in both the U.S. and overseas. Thus far, I haven't seen any of the "Talk" remixes included on a the maxi single releases, but they may be included at some point. However, they are available on iTunes, and definitely worth purchasing.
The remixes promoted in the U.S. include the Junkie XL and Francois K mixes. Junkie XL has done a number of notable club remixes of rock tracks in the last couple of years. Their mix is outstanding - it maintains the beauty and emotional intimacy of the song but adds a distinctive "buildup" at the beginning and a strong rhythm underneath to bring it up to a whole new level.
The Francois K remix of "Talk" is a complete reworking of the song - bringing it more in style towards Kraftwerk's original "Computerlove". Very electronic, very "detached" - definitely quite an accomplishment but in my opinion not as good as the Junkie XL mix.
"Talk" will reach #3 on the Billboard Dance/Club Chart as of early March 2006.