Hi, Im going into the music store in a little bit to look at some wah wah pedals, and I'm wondering, what are some good iffs and stuff to play while testing them out? Im not extrememly familiar with them, but I have played around with them. Any help would be appreciated.
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It's not a song, but I do it whenever I try out a wah pedal. Put on distortion, then trill between two notes (i.e. 7th & 9th frets, g string). Turn on the wah, pull it all the way back, then slowly take it through the whole range of the wah and back again while doing the trill. This gives you a really good idea of the wah's range.

Hope this helps.
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Rage Against the Machine - Bulls on Parade is basically what everyone trying out a wah pedal plays. F#5 chord with wah. Make sure you try out the wah's through a rig that is as similar as possible to the one you have at home. You don't want to try out a wah on a Les Paul standard through a JCM 800 only to find out you hate how it sounds through your beginner's epiphone and 10-watt practice amp.
While I hate that Buck Cherry song, the guitar in it is pretty good, and good for a wah test.

I would run through a few blues licks, Red House, Sky is Cryin, that sort of stuff, even if it wasn't recorded with wah.

ManowarMike's idea is a good one too.
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