[dazbradbury]

If you're using .net, RequestReduce [1] is an excellent tool for managing your static assets.

[1] - https://github.com/mwrock/RequestReduce

[andrewdavey]

Also check out Cassette http://getcassette.net/

[seriocomic]

+1 for this link. I can't understand how I haven't come across it before...