I've used Rosetta Stone for Japanese and French mostly. I'm so busy elsewhere that I wasn't able to keep up with it, but what I did complete I remembered pretty well. The program provides you with word<>image matching and speaking/writing exercises.
I still believe there's nothing better than a good teacher and human-guided exercises (plus years of experience). As you said, you don't have time, but what you're doing is great; if you were to combine Rosetta Stone with speaking practice with real spanish speakers, you'd achieve some degree of success. But you'd have to do it everyday.
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