Here are some sites I found to be very useful for Ajax developers, this month I have an project to build Ajax interface on one of the websites and you know as php developer ajax comes very handy.

List of Top 5 Ajax Codes for Developers by Live Crunch

1. Ajax Auto Profile-Person Suggest

Demo:Auto Suggest Demo - Just type in 1 letter the rest of the job let ajax handle it for you.

2. Flickr Ajax Editing Fields

- Love this type of editing fields

Demo: See Flickr Editing in Action

3. Ajax Tabs Content

4. Ajax Calendar

5. Ajax Upload Form Code

Demo:Ajax Upload Code