SF Gate has posted a piece on what it is like and it doesn’t sound bad:
Paul Baltescu was a two-time intern in 2010 and then again in 2011. He said he worked on tons of different projects, including Display Ads and Mobile Search, which helped him hone his computer engineering skills.
Long says Google has the system down pat. First, you get a phone call from your host, who tells you a little bit about the area you’re being assigned to so there are absolutely no surprises — you can even choose to decline that project if it doesn’t interest you!