I did look at Bikepedia, and they didn't seem to have that model, it is probably lower end and from walmart so I just figured I'd see if there was a quick trick like "the first two numbers are the month, then the second two are the year!" If it's not super easy I'm not sure it's worth pursuing. I'm probably just going to use the frame as an outlet to experiment with mods eventually...it would be cool to have all the facts about it though so later on I can be like "and this was a 20xx Schwinn Sidewinder 2.x frame that I added a blah blah blah too, the original blah blah blah" and sound like an expert.
guess we can't have our cake and eat it too, ;-)