From : http://ajaxian.com/archives/groups-of-50-ajax-examples

Noupe keeps the roundups going with Most Wanted Ajax Techniques: 50+ Examples and Tutorials that consists of a lot of projects we have covered over time, but some new ones, and the added touch of putting it together in one place.

Ajax Forms

• Server side jQuery with Jaxer
• Ajax login form (PHP & Javascript)
• Form Plugin

ShoutBox

• wTag (Ajax shoutbox)
• Shoutbox Ajax

Validate a Username AJAX

• Validate a username using Javascript and PHP ( AJAX )

Ajax Instant Messenger

• Ajax Instant Messenger
• Ajax and XML: Ajax for chat

Ajax Tabs Content

• Ajax Tabs Content
• AjaxControlToolkit TabContainer

Ajax Shopping Carts

• Drag and drop shopping cart

Ajax Star Ratings

• Starbox
• Unobtrusive Ajax Star Rating Bar
• CSS: Star Rater Ajax Version

Ajax Inline Edit

• Easy AJAX inline text edit 2.0
• Ajax.InPlaceEditor
• Edit In Place with AJAX Using jQuery

Ajax Progress Bar

• jsProgressBarHandler
• A YUI Loading Panel Widget

Ajax Pagination

• Ajax Pagination Script
• Preloading Data with Ajax and JSON

Ajax File Browser & Manager

• jQuery File Tree
• jQuery File Tree

Ajax Calendar

• Vista-like Ajax Calendar version 2
• Quick Calendar Using AJAX and PHP

Ajax Photo Manipulation

• Phototype
• mooImageCrop

Ajax Dynamic Image Gallery and Slideshows

• Dynamic Image Gallery and Slideshow

Ajax File Upload

• Max’s Ajax file uploader
• Ajax Multi Image File Upload
• jQuery Multiple File Upload Plugin

Ajax AutoCompleter

• Autocomplete Control Version Released
• FaceBook Like – jQuery and autosuggest Search Engine

CMS

• NicEdit
• FCKEditor

Polls

• Ajax Poller
• Creating a Dynamic Poll with jQuery and PHP

Tabular data manipulations

• Sorttable
• Flexigrid
• DDDrasticGrid
• Improving Extra wide Grid View

Miscellaneous

• Ajax Scrolling pages
• jTip – A jQuery Tool Tip
• Ajax Broken Link Checker
• Facebox
• Drop Down Panel script