I'm a little off topic because this is under 3rd Party Apps, but have you found the many Spanish instructional podcasts in the iTunes store? They are free, and they start out very basic. I took 4 years of high school Spanish and am using the podcasts to brush up. I know the Coffee Break ones offer a premium podcast for a price and you can get the written materials (PDF) for a price, too. I don't need that because I can read Spanish better than I can speak it.