i found a few and researched reviews that compared the following:
rosetta stone of course
RS and TL are supposed to be pretty similar as both use images and audio with flash cards. TL is much much cheaper. Pimsleur is pretty much a listen and repeat only. but, they have comprehensive packages with books that are fairly costly.
i myself have a copy of RS version 2, which is old, of Spanish Latin American. i have a copy of Spanish (Spain/Castillian) version 3.
i will purchase TL i think but am deciding on either downloading (plus u can put on mp3) or cds that are windows and mac compatible.