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To add on to this idea a bit: It would be nice to have a general "ignore list". Similar to the way you can define files to ignore in SVN or Git. This way when downloading a folder I could have it ignore files I don't need. For example:

and so on...
Wow, that's actually a pretty cool theme! I'll have to port that into TextMate.

General themeing would be nice for Textastic, too :)
I can't believe this doesn't have more votes! I love the app and I look forward to future features but regex is my number one.