1. Go to Thottbot: World of Warcraft
2. Go to the vendor, item, etc. you want.
Ex: I want hogger - Creature: Hogger - Thottbot: World of Warcraft
3. Press on 'Activate 3D Model Viewer'
4. Press on 'Embed'
5. Copy all the text into NotePad or text program
6. For Hogger I got this..
Code:
<object width="600" height="400" codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab"> <param name="movie" value="http://i.thottbot.com/f/modelviewer.swf" /> <param name="quality" value="medium" /> <param name="bgcolor" value="#FFFFFF" /> <param name="allowScriptAccess" value="sameDomain" /> <param name="FlashVars" value="modelType=8&equipList=&model=384" /> <embed src="http://i.thottbot.com/f/modelviewer.swf" quality="medium" bgcolor="#FFFFFF" width="600" height="400" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" FlashVars="modelType=8&equipList=&model=384" pluginspage="http://www.adobe.com/go/getflashplayer"> </embed></object>
The large red text is the Display ID. I prefer this over other sites for some reason, maybe because I get to play w/ the models too! 
So yeah, it's fairly simple, may be harder than other sites, ahh well xD!