It's fairly difficult not to trip over sites offering HTML templates, and there's a lot of material repeated on different sites, but just in case you've missed them, here are a few of the better ones. This is a short list as they all tend to include links to similar sites, so I'll not bother repeating them.
GetFreeTemplates.com Just what you'd expect.
SmartWebby If you're specifically looking for Dreamweaver templates, this is as good a place as any.
TemplateTimes The are some decent, professional looking templates here, though it's a subscription based site rather than all freebies.