I've just read, on Liz Smith's column in the New York Post, that there are some Naked pictures of Heath Ledger floating around the internet (and we're not just talking a back view as per the film).
They apparently look like candid shots from the sceen in Brokenback Mountain where Ledger and Jake Gyllenhaal jump into the lake. Jake is not included in these shots (unfortunately), but says Liz, 'If these shots are genuine then Heath has no need to feel embarrassed'.
Now I'm just off to do some research on your behalf ..............!