The official DDR files are hands-down the most popular. You can find those at Zenius-I-Vanisher and/or DDRUK (may need to register to get them).
The official In The Groove files are also popular, and good for moving beyond DDR difficulty.
Aside from those, there are huge lists of popular packs, most of which are "keyboard" files (meaning that they are too hard for feet, and require a lot of keyboard skill).
Good places to find miscellaneous files include r21 and BemaniStyle.
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