Is there any way to get tabs in Finder? I often need to open many finder windows at the same time and it pollutes my desktop.
TotalFinder "brings tabs to your native Finder". It's commercial software, however. There are some other Finder replacements as well.
A free alternative for OS X 10.6.8 to 10.8.2 is also XtraFinder, which supports Tabs as well.
it was already mentioned but PathFinder is an incredible app. Plus there is a mac bundle site with it on discount right now. MacPromo Bundle
Mavericks (MacOS X 10.9) brings us native tabs in the Finder (finally).
IMO, I would wait before buying any program/app, as the new OS from apple, aka: lion, will probably address the finder and its shortcomings.