No contact? Have they sent you an invoice? Have they left feedback for anyone or listed new items in the last 5 days?
If the answer is no, they may be having computer trouble, be in the hospital, or have some other kind of emergency. (or maybe not).
If the answer is yes, sounds like you're being ignored.
You just won today and it's Sunday. Give them a few days. After that, you can get their phone number to call, or address to write through eBay.  
>Click<Also check
>THIS< link if all else fails.
WELCOME to the forum, and Good Luck.
p.s. I don't think I would bid on an item if the seller didn't answer questions. If you get bad service before the sale, you will likely get the same after.