PPinger

PPinger helps you use your visitors to ping Pingomatic.com that your blog has been updated.

It randomizes between pinging a randomly selected amount of these RSS aggregators:

Weblogs.com
Blo.gs
Technorati
FeedBurner
Syndic8
NewsGator
MyYahoo!
PubSub.com
Blogdigger
BlogStreet
Moreover
Weblogalot
Icerocket
NewsIsFree
TopicExchange
GoogleBlogSearch
Spinn3r
Bloglines
PostRank
SkyGrid
Collecta
Superfeedr

It is a good help for getting new blogs indexed.