Guitar

Backing tracks are songs without some of the instruments. Like in karaoke there is no voice, this songs are the karaoke version for guitarist, drummers, etc.
Some usefull keywords when searching this kind of music are: drummless, play-along, guitarless, music minus drums, backing tracks...

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Guitar backing tracks

• http://www.guitarbackingtrack.com/: great resource of backing tracks. Use the alphabetical bar on the top of the page to browse by artist. You can listen the tracks online or download them as mp3;
• guitarbt.com: has a big list of guitar backing tracks, most are MIDI versions with no voice on them;

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Drums backing tracks

Songs without drums! Useful for training drums and listen do song details without the drums interference (useful for guitarists).

• Some great resources are the games Guitar Hero and Rock Band. If you have the games you could record the songs without the desired instruments. Some of this have already slipped to the Web in the form of mp3, if you can find them;
• A great resource is the forum music4drums.net. It has a lot of drumless tracks. After registering, making your personal presentation and comment 2 discussion thread you'll get access to the drumless-songs thread, where you can download the mp3! It's well worth the effort! After registering see the drumless tread;
• http://www.esnips.com/web/MusicMinusDrums has a couple of drumless songs;
• http://www.freedrumlessons.com/drum-lessons/drum-play-alongs.php