I'm headed out there for the month of May and some of June. I'll be spending most of my time in Yosemite, but want to check out the Tahoe areas and the Needles. What are the guidebook recommendations?

Any of the books by Supertopo are great ones: Lake Tahoe Climbing, Yosemite Free Climbs.

Thanks. I should clarify that I've got Don Reid's book Yose. Free Climbs. I was looking more for Tahoe area/The Needles, so thanks for the supertopo suggestion.

the regular Needles guidebook is out of print and has been for some time.

But, if you're planning on doing the classics that everyone seems to do, they're in SoCal Select, which you can still get a copy of. Clint Cummins has a lot of needles info on his web page, scroll down to find copied guide pages and good hand drawn topos:

http://www.stanford.edu/~clint/needles/index.htm

For the Tahoe area, the Falcon guide is the best comprehensive guide, it covers Donner Summit and some North Lake spots.

If you just want to hit the 'select' routes, the South Lake Tahoe Supertopo might be better, since it will point you to the classics and gives more other camping beta, etc.

I think you can get used copies of both online and save some $, if you plan ahead and order them now.

Just like Caught said for Tahoe. Mike Carville's Falcon guide book is great. It covers everything you need to know in the area.