AjaxCoded

Bloglines has been the top RSS Reader for a couple of years now . Probably not so much for how great it is, as much as there was nothing else that even came close.
I tried Google Reader a long time ago and could not get the feel for it. It was nice looking, AJAX driven, but very clunky. That has changed.
Google Reader is now a first class RSS reader. I have been using it for about a week and I am already very comfortable with the interface. Like Bloglines it has a split panel with the RSS subscriptions [...]

XML.com has a good article on building a simple RSS News Reader using AJAX.
The article steps through each aspect of building a reader with in depth explanations and also has the source code available to be downloaded.
Why are we using Ajax to parse our RSS? By using Ajax, we are passing over the work of processing the RSS XML file to the web browser, thus reducing server load. Also, Ajax allows the user to have a more seamless web experience, because we are able to fetch the entire RSS XML file from the server without having to refresh the page. [...]

24Eyes is a RSS Dashboard aggregator. Unlike Bloglines and most other aggregators it allows users to place RSS feeds from specific sites together in a very user friendly format.
Is it a better format? That would depend on how you want your information formatted.
The downside is the user is limited to pre determined feeds, or OPML feeds and to read a article reguires a new window to open.
Overall very nice looking site, it is just up to your personal taste as to the usability of this aggregator.
Link : 24eyes - The Premium RSS Dashboard on the Internet

Here is another cool Ajax site. Definitely in Beta mode, but worth a visit. I really like the layout although the earlier layout may have been a little more user friendly.
blabb works the way I would expect Ajax sites to work. You can search for tagged sites and then read the summary RSS or Expand it. You can also see a complete view of the site before visiting. In my mind this is one of the main reasons for RSS and Ajax.
A few more options and some instructions would be nice. It seems that once you select Yesterday or Today [...]

Pandora released their RSS feeds this week and several feeds are available for Top Rated stations, artists and tracks. At CybersMusic.com we wanted to dynamcially display the Top Tracks. Using Blogger limits the use of methods to accomplish this task. Enter AJAX.
First we created a PHP page to read the Pandora feed. Then we used an AJAX script from Dynamic Drive to read the PHP page into the sidebar. The output works exactly as needed, the only downside is that most (if not all) search engine crawlers will be able to include the content as it is javascript.