Good list to have for Alter Self if your from a humaniod race:

Locanth Swim 60
Merfolk Swim 50
Aquatic Elf Swim 40

Decent (but not full) list can be found here: http://www.dandwiki.com/wiki/SRD:Humanoid_Type

That sight isn't as fast as d20srd.org but I like the layout better for many things.