Thanks so much! Not having this feature made me feel very insecure whenever using Safari instead of Firefox.

Also, a tangential thanks for letting me know that SIMBL had been updated for Snow Leopard. The transition to Safari on Snow Leopard was difficult because all of a sudden all of my plugins no longer worked--no ad blocking, no auto-restore from last session, no force new windows to open into new tabs, etc. Brutal. Now I can go look for 64-bit updates!