Oh yeah sure. 40 yearold virgin has no fedora but I still consider it noir in some aspects too. Sin City I'm not sure about. I think someone wore a fedora in that, but it's definitely dealing with a lot of noir themes and such. Blade runner i consider very noir too, but a sci-fi sort of noir I guess. In my mind it's all about style..., and sometimes the all the problems the protagonist has but, overall It's that distinct noir style that i love. You'll see some noir style in pee wee's big adventure, back to the future, ninja turtles, matrix, robocop, a lot of movies.
A lot of movies.
The fedora is the key to my favorite kind of noir , the old school style, without it it's not 100% noir to me. I think it'd have been really great if Nolan payed homage to batman's roots stylistically in that way. Ledger would look great in a fedora.