to the best of my knowlege
1) Do AA/epic title's only work with the SoF client or can I use them with Titanium?
Will work with T
2) Will I be able to see drakkins and the new SoF item graphics without the SoF client,or will I just be unable to zone into SoF zones like on live.
No. Anything with SoF graphics (drakkin, new weapons, new mobs) - requires SoF installed. If you encounter drakkin while running a T client, it will appear as naked human
3) Can people who have titanium client use the raid window or is it only functioning for those that have SoF
They should.
4) Can I use all my AA's or will I not be able to use SoF AA's (if there are any)
T client will obviously not have access to SoF AAs
5) Can I use potion belt with titanium?
You should
6) Can I use all clickies?
You won't be able to use those that use new SoF spells or effects
7) Can I use the Bazaar correctly,or is it only working right for SoF?
Bazaar is fully working on T from what I know
Do I need SoF for chat channels and in-game mail?
T should work with both
Overall MOST things are T- compatible. Over the T the SoF offers you: new race, new npc models, new weapon models, 100+ new zones.