This is to the person who said there's nothing to Ginny on the first page... HA!!!! Ha, ha, ha!
There's a lot to Ginny. Fred and George (who, despite their 3 owls apiece) are powerful, talented wizards, and she gets an endorsement from them. According to Ron, Ginny was best when it came to throwing off the Inquisitorial Squad with her bat-bogey hex. She's determined, she's powerful, and she's straight-forward. I think she's the one who'll end up with Harry.
Also, I like the Harry-Luna possibility. At first glance, Luna is a frikkin annoying character, but as you get to know her (and as Harry gets to know her) she's a lot more likeable and smarter and more talented than she seems. She and Harry seem to understand each other and sympathize with each other.
Ron and Hermione... I'm with the rest of you guys on that: it's a gimme.
Padma and Cho - shallow little twerps.
I say that, if J.K. Rowling goes with romance for all the characters at all, she'll have Harry with either Ginny or Luna, and Neville with the other one. Neville's got a crush on Ginny and always has (the reason he was caught and taken to Umbridge's office with Ron, Ginny and Luna is because he fought when he saw them taking Ginny... he also took her to the Yule Ball.) But I think Neville and Luna could be a fun couple to watch.