I generally use Google Maps, but they don't have transit directions for Buenos Aires. What are some similar sites that I can use, extra bonus for sites with mobile web interfaces and/or iPhone applications.
You might want to check out:
- The official site for the Buenos Aires Government Transportation Authority which has an iPhone App
- You might also consider the Official City of Buenos Aires Website
- If you want to buy bus tickets to other cities, consider Plataforma 10
If you are staying in Buenos Aires for a considerable time you will save money with the SUBE card. I am not sure about the requirements for foreigners though.