Patch 3.3.5 introduced a bug that will force WoW to crash in and around Dalaran, this is mostly with the people running 64bit OS.
Solution 1: lower your settings:
Set the following settings in wtf.cfg
SET farclip "727"
SET gxApi "d3d9ex"
SET gxTextureCacheSize "128"
Solution 2: modify your wow.exe to enable program to be Large Address Aware.
Solution 2 borrows a mechanism from Fallout3.
Personally, I've had this kind of problem ever since I upgraded my gaming box to a 12gb 64bit os back in January. 3.3.5 nearly makes it impossible for me to play in Dalaran. Hopefully this helps.
3.3.5 and Dalaran bugs
Moderators: Texaporte, sphie, Pocky
3.3.5 and Dalaran bugs
Found on my paladin forum:
Re: 3.3.5 and Dalaran bugs
From another thread with blue responses, the fix that doesn't require hacking the wow.exe should be forthcoming; the LARGEADDRESSAWARE flag is apparently coded into the SCII client, so at least the implementation exists within blizz.

