Mobile websites are becoming more popular, and you need a way to test everything on different phones.  Here is a list of emulators that will get you started.

The Emulators

• Android emulator
• Blackberry emulator
• Dot Mobi emulator
• Firefox Mobile emulator
• iPhone / iPad / iPod Touch emulator
• Klondike WML emulator
• LG emulator
• Microsoft Devices emulator
• Motorola emulator
• Mozilla Fennec emulator
• NetFront emulator
• Nokia emulator
• OpenWave emulator (archive)
• Opera Mini emulator
• Opera Mobile emulator
• Palm emulator
• Palm Pre / iPhone emulator
• Samsung Java emulator
• Samsung Platform emulator
• Windows Mobile emulator

I know I am always looking for emulators, so hopefully this list will help you out.

Six Revisions has a great article on best practices for mobile.  Be sure to check it out, that is where I got this list from.  Super helpful. Thanks!