I just purchased 2 cobalt flux ddr pads and they have ps2 plugs on the end. I am wondering if you can point me in the direction of some ps2 to xbox plugs and also some ps2 to pc plugs as I would like to hook it up to my pc as well.

There are a number of converters out there to go from ps2 to xbox. Do a search on ebay for "ps2 xbox" and you will find them.

here is the first one I saw:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...8147063457&rd=1

You can also find them at compusa. and most game stores...

Any particular brands recommended? Or will any do?

I think they all work equally well. (heck, they are all probably made in the same sweat shop in china!)