Anyone know of a dual sim card thingy that would possibly fit into the BB Storm - so I don't have to buy some crappy data plan with O2. Figure if I can just run both a Vodaphone and O2 chip, it'll work out a lot easier in the long run. Any ideas, anyone?

Nothing like that out there that I am aware of.

There's this company. Very expensive and they're in China. With the long startup times of Blackberries it's probably easier just getting a second phone.

Dual sim card for mobile phone BlackBerry 9530-Storm

You can also try Ebay, although the Storm isn't mentioned in here:
GHOST DUAL SIM FOR BLACKBERRY 8100 8120 8130 8820 8830 - eBay (item 170372725270 end time Oct-15-09 06:14:30 PDT)

Someone reviewed an adapter from the Chinese company in an older Blackberry. Can't remember if it was here or another forum.