If youre ever going to run larger TGPs with your database across domains you might want to look at this -
http://www.apscripts.com/
After many attempts with other scripts mentioned here, its the only one that has held up with a lot of pages and tons of traffic - including rebuilds that take the rest of these scripts to their knees.
I dont work for them - but after seeing some of the largest traffic TGPs run it with no problems I was convinced
added - and I think the server lic is only around $800 or so