Cute heart pins from Margot Potter (and some permission-free vintage images to use with them!)
Beaded heart suncatcher from Ornamentea - there's no pattern but it looks like you'd be able to wing it pretty easily.
Sand Fibers has great downloadable heart cuff patterns and a sale on things with a heart on them!
I suppose it's too late to get other online purchases in time for V-day unless you pay for express shipping or something (which is why I've been concentrating on posting links to tutorials instead) but Chinook Jewelry's hearts are the cutest thing ever. And it's not like you can't wear them the rest of the year, of course!
Adorable valentine images at The Graphics Fairy
Valentines from Alexa at The Swell Life
Labels for Valentine CDs from the nice Chronicle Books people
As for me, I have not actually done any Valentine crafts this year, nor have I sent anybody cards, which I do most years. Instead, I have been painting paper-mache eggs. Go figure. I have been experimenting and don't really have too much finished yet, but I am not going to post any pictures of those until closer to Easter, in any case. So you just get to wonder about what I'm up to for a while! (I'm sure you're gonna be on pins & needles...)