Aish.com is better than fantastic, it’s awesome! Frumteens.com has generally attracted (so I’m told) kids not necessarily OTD, but with questions. Definitely not das Torah. However, I did find it helpful in figuring out what types of hashkafa various semanaries in EY have, ie those that were traditional Bais Yaakov, versus those that are “chilled” Bais Yaakov – and those that were very text oriented.
For the BT’s on this site, please check out BeyondBT.com. A great resource for the issues that tend to occur in a BT’s life even if they’ve been frum for many years.
As for asking questions, shouldn’t that be left to your LOR?