Free Coins, Zombucks, & Gems

Search for your coins/zombucks/gems using the double value. Find it, change it, perform an action that rewards coins and/or zombucks. Refresh the game. (works the same for XP)

Free Sunpower

Start a level, choose double value, scan for your sunpower, collect sunpower or buy a plant, set speedhack to 0.0, scan for the new value, when you find the correct value change it to what ever you want. Turn off speedhack, and enjoy.

Freeze Rubies
(NOTE: This will freeze everything including XP, Coins, Etc.)

Scan for your XP until you find the right address. 

Right click and choose find what writes to this address. Click Show Dissembler on the right.
http://screenshotr.net/showimage.php?id=1141

Change to;
http://screenshotr.net/showimage.php?id=1143

Here is also my crappy video explanation; 
http://www.youtube.com/watch?v=goPfMivqi48

If anyone is wondering why we are searching for XP instead of gems is because they seem to share the same line.

Thanks to Flashacking for Coins & Sunflower cheat.