Here is the 2006 one. The 2008 one would be a good bit different I guess since most firms bumped 30k that year IIRC. I would be much more interested in the 2009 one, though.http://www.adamsmithesq.com/archives/2008/07/the-bimodal-starting-sala.html
(The rest of this post, I am going to assume we are in 2007 or 2008)
Anyway, yeah it's bimodal, but it's not "you're making 160k or 40k" for most of the posters on this board. Almost everyone here will have better credentials than T3/T4 lawyers and better than people that finish in the bottom half of a T2. That covers 5/8's of the distribution, which would be like the entire group making under 65k. So, the posters with pretty much the worst credentials on this board should start out at 65k. That's not that bad, especially consider that of the remaining 3/8, most of the posters here are in the top half of a T14, which makes them around the top 8% of the remaining 1/3.
Also, even though there's definitely 2 humps, just from eying it, probably 1/6 or so of the legal market is at 70-120k, which is a pretty significant amount.
And finally, I really doubt the people making 40k/y continue to make that their whole career, despite the fact that posters here will want you to believe that. The median salary for attorneys is like 100k, and the median starting salary is like 62k. That first hump moves.