I predict it will be won by the first team to win four games.
(Well, after the All-Star Game, you never know...)
Seriously, the teams look pretty evenly matched to me.

Points in the Angels' favor:
Slightly better bullpen, including the "K-Rod" (and I love that nickname) X-factor
A manager who's learned from his one postseason boneheaded in-game move
Home-field for seventh game
Lineup prone to unstoppable phases

Points in the Giants' favor:
Bonds
Slightly more reliable starting pitching
A manager who looked great compared to his NLCS counterpart
My brother's in-laws as fans

Both teams have been clicking on all cylinders and strike me as exceptionally solid from 1-25 on the roster, as opposed to relying on front-line talent as the Yankees did in their recent run.
Because I must make a pick, it'll be Angels in 7.
Check out Rob Neyer and Derek Zumsteg for some good analysis of why the
Angels should pitch to Bonds more often than not.