d12) Interesting pick for RttToEE locations. I looked over a few areas myself before deciding.
Stuff I use most from the FR books in my Current Campaign...
Forgotten Realms Campaign Setting- Particularly the Dalelands. I'm using the whole Drow/Cormanthor backdrop (both the Auzkovyn Clan and Jezz The Lame's faction House Jaelre). One of my player's is playing Gwenect Moondark, a female Drow Ranger and defector of House Jaelre (originally rescued from Skip William's Raiders Of Galath's Roost). I'm also using Jhaer Brightsong, female Elven Bard of reknown of Ashabenford as a contact of the party (unknown to them is the fact that she is a Harper in my campaign, with her eye on the Drow Ranger to possibly become a future Harper (PrC).
Faiths and Pantheons- One of my other players (also rare poster here known as Priest Of Kossuth) is running a Cleric Of Kossuth looking to become an Elemental Archon (PrC). This will be VERY interesting during the planned RttToEE.
Magic Of Faerun, Races Of Faerun- Both are open to my players should they want to use spells, feats, skills, races etc.
Monsters Of Faerun, Lords Of Darkness- Used by me as needed.
Silver Marches, Unapproachable East- Both are excellent IMO, I wish the Silver Marches was available sooner. I may have moved the campaign here rather than travel the Dales. My own Mithriltooth Dwarves (mostly NPCs) are from Citadel Adbar...
Thorzoun Mithriltooth, The Arcane Anvil Of Adbar (current NPC/PC), Wiz5.
Grymforge Mithriltooth, Father Of Thorzoun, The Iron Anvil Of Adbar (former PC/NPC), Clr10/Ftr3 (according to conversion pdf).
Thorzoun wields a Masterwork Warhammer forged by his father (Hammer was also known as the "Iron Anvil"). Thorzoun aspires to enchant the weapon later (turning it into the "Arcane Anvil"). This will likely pass down to the next of the Mithriltooth Bloodline.
I love the Realms.