Internet Capital Group went public during the last bubble when B2B and incubators were all the rage.

http://en.wikipedia.org/wiki/Internet_Capital_Group

As an investor I would stay away from VC funds that went public. I'd want partners to have a lot of their personal capital tied up in the fund, not cashing out in an IPO.

Hercules Technology Growth Capital (http://www.htgc.com/) is listed and based in Palo Alto. But the entire listed VC and PE market is undervalued, they all trade at substantial discounts to the value of their underlying portfolio companies (but on the other hand how do you/they measure this?).

GSV Capital (GSVC) is the closest thing to a public YC. But they aren't. They invest in later stage venture backed companies. I'm not aware of any other public venture funds, which aren't really comparable to YC, being that it does early stage deals exclusively.