In terms of climbing guides, "Rock Climbing: Yosemite Free Climbs" is great. You may also want to check out "Rock Climbing: Toulumne Meadows" both by Falcon Publishing/Chockstone. Also check out Supertopo.com for terrific e-guides.
As mentioned in previous posts, you may want to check out my recent Climbing Trip report. I really couldn't recommend Nutcracker (5.8 5-pitch) more -- really a "must" climb while you're in Yosemite. I've also heard good things about The Braille Book (5.8 6-pitches). Unfortunately, despite Chas' recommendation, I was too intimidated to tie into Commitment (5.9 3-pitch). The good news is that you'll have a lot of quality 5.9/5.10 choices.
Of course, I guess it also depends on what you're looking to do. Hopefully, if I get back again later this year, I'll get in some moderate full-day walls such as the East Buttress (5.10c or 5.9 A0 11-pitches) of Middle Cathedral, Royal Arches (5.10b or 5.7 A0 16-pitches) Northeast Buttress of Higher Cathedral (5.9 11-pitches), the South Face (C1 5.8 10-pitches) or the Prow (C2F 5.6 12-pitches) of Washington Column, or the West Face (C2F 5.7 11-pitches) of Leaning Tower. However, I'll need to be in much better shape than I was two weeks ago!!!
I'm sure Chas will have some additional recommendations......