PRmac.com (you have to do it if you've got an app and it's cheap) and 3 times I used prweb.com which is much more expensive (and there is a lot of discussion to know if it is profitable but it is more professional). For the ads I went to theiphonemom.com and bestkidsapps.com. Honestly I don't know if the ROI is enough for ads on these sites - I've stopped advertising there but I looking for new place (or will come back to these places) to put ads because I have to