WordPress Plugin WP Greet Box Description:
This plugin lets you show a different greeting message to your new visitors
depending on their referrer url. For example, when a Digg user clicks through
from Digg, they will see a message reminding them to digg your post if they
like it. Another example, when a visitor clicks through from Twitter, they
will see a message suggesting them to twit the post and follow you on Twitter.
You can also set a default greeting message for new visitors (not matching any
referrer URLs) suggesting them to subscribe to your RSS feed. Having these
targeted suggestions will help your blog increase exposure, loyal readership,
and reader interaction. Best of all, this plugin is compatible with WPMU
and various WordPress cache plugins (so you do not have to sacrifice speed).
Related to WordPress Plugin WP Greet Box
WPSlug.com data has a list of 180 WordPress CMS installations Using the WordPress Plugin WP Greet Box.