I made some word bubble shapes for Photoshop. I'm running Photoshop CS6, so I dont know if it will work on older versions. This is a CSH file, and needs to be put in your photoshop shapes folder.
Installing .csh in Photoshop 4 Dummies:
Go to your Program Files (usually in the C drive, which can be found in My Computer)
Find and go into: Adobe folder
Go into: Adobe Photoshop folder
Next open: Presets folder,
Then Open:Custom Shapes folder.
Take the .csh file from the rar file you can download from here and place it in that folder. Next time you open Photoshop it should load up in the shapes.