I reckon he must have a decent singing voice since he tried out for Moulin Rouge and all. (I've forgotten that scene in 10 Things I Hate About You, it's been so long since I've seen it.)
I just happened upon Casanova the other night. I quite liked it. I had avoided seeing it when it first came out on the heels of Brokeback because I wanted Ennis to live on in my mind in the form of Heath, and I didn't want to risk losing that in some way. Crazy, but true. But after lo my many viewings of the latter, Ennis exists separately from Heath, so seeing Heath in other things is like seeing a completely different person in other things. Also crazy but true.
Anyway, I thought he did a really lovely job in Casanova, as always. Man, that boy does understand how to kiss... And I'll say it again, and this is saying a lot coming from a confirmed Gyllenhaalic - he has the most wonderful eyes. The brighest light shines out of them. They glitter and sparkle like stars.