Totally late to the party here, but I was browsing the forums and came across this gem. Great discussion, and I'm glad that the poster decided on Yale!
Even though it isn't relevant to the current poster, I wanted to post in case it might help some future applicants. I currently work in investment management at one of the BBs, and wanted to address the questions about career prospects.
First, I think there is a misconception among some posters that you need an M7 MBA to get into IM. Not. True. The fact that it's hard to recruit for IM from any top school (M7 or otherwise) is largely a reflection of the fact that these jobs don't generally require MBAs at all and have low turnover. People like their jobs for the most part, so they don't leave. If they do get MBAs, they often do part-time programs. That's my experience, anyhow. It may differ between equity research, private wealth, institutional asset management, etc. and may also depend on the firm to some extent.
I will say that an MBA can definitely improve your chances, as can a CFA (or CFP for the private wealth route). Regardless, you will need to network well. These jobs don't usually need to go out and formally recruit on their own, and do a lot of hiring through referrals.
As for IM at SOM specifically, I was able to chat with a rep from the IM club and got some color on this area, too. While IM isn't Yale's strongest recruiting area (certainly not as strong as IB, for instance), it sounded like this mainly came down to reasons stated above, and less due to the resources the school offers. In fact, the guy I spoke with had an internship in equity research and due to Yale's location, he was able to maintain this job on a part-time basis (it was in NYC) throughout his second year. This student had to actively network to get his position, but he wasn't an anamoly. It's also worth noting that Yale alums run the endowments at Yale, Harvard, and Princeton.
Suffice to say, relative to the IM MBA recruiting scene as a whole, I don't think Yale is doing half-bad.