Apple has released Java for Mac OS X 10.6 Update 2 for Snow Leopard users, updating Mac OS X's Java SE 6 to 1.6.0_20 and delivering "improved reliability, security, and compatibility for Java SE 6." The only details given revolve around security fixes, so it's probably worth downloading this update even if you don't anticipate using Java applets much. The update requires Mac OS X 10.6.3. (Free, 78 MB)
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Constant Dictionary Definitions
If you hold down Command-Control-D in a Cocoa-based application that supports AppleSpell, you'll see little dictionary pop-ups for each word that you mouse over. Neat, eh?