Yahoo Mail beta is Yahoo's answer to Gmail: webmail like desktop mail - thanks to Ajax. Normally it's hard to get an invite, but here is a how-to to get yourself invited immediately (I just got invited, see screenshot):
How to change your content preference:
- log in to Yahoo Mail
- click Options
- select Account information from the left panel
- go to Member Information, General Preferences, Preferred Content
- select, for example, Yahoo UK
- click Finished
- go to Yahoo Mail
- you’ll see a page that says “It’s the New Yahoo! Mail Beta… and you’re invited.”
- click on “Try Beta Now”.
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