Update 2012-10-05: freelanguage.org is no longer recommending Rosetta Stone for Spanish learners. There are so many other options out there for much cheaper, with more useful features and that take you further along in the learning process.
The tools previously linked to below are no longer online.
Just released a nice tool for people to find cheap Rosetta Stone Spanish software!
This is part of a growing marketplace for language products being made available here on Free Language.