im in the sandbox too 
49% of my traffic comes from SE
SE breakdown
48% from google
45% from msn
5% Yahoo
2% Other
so near a 1/4 from google and 1/4 from msn is my traffic
all my hits from google are non keywords, none , zero – so im really looking forward to getting out of the sandbox as my rankings should be great as i hold loads and loads of 1st page very competitive keywords in the allintitle & allinanchor searchs – which gives you an idea of where you will rank when you come out of the sandbox.
I hold lots of top spots in msn(and msn is still less then google)
But in the UK google accounts for 70% of SE searchs, as opposed to 50% global.