I don't think that is low actually, not if you're running stock @2.4ghz. A mate has a similar setup to you. BFG 8800 GTX OC2, 4gb ram, vista64 but with an e2180 @3.2ghz and he scores about 11300. When i was overclocking my e2180 to 3.2ghz my 3dmark score was flying up every 2-300mhz i did. I reckon if you were running at about 3.4ghz (like a lot of e6600's do) you score would be a lot higher.
I don't take too much notice of 3dmark06 scores these days. My mates system is exactly the same as mine. That includes overclock and memory timings, apart from he has the 8800gtx oc2 and i have 8800gt OC. We score about the same in 3dmark06 1280x1024 but when playing crysis @1680x1050, his is noticeably faster