depends on what you're doing, as tron says. ezcd cremator is pretty good overall but it won't overburn or copy protected disks. it is by far the best at multisession.
i would definitely add discjuggler. also, fantom cd is very awesome at burning. if you're doing audio you certainly should use either feurio! or eac. nero is probably best for vcd but i don't even have it installed anymore. for sure, clonecd for protected copies (even though fantom and cd mate do just as well). i don't like the new clone and i still use 126.96.36.199.