Mark Pedersen

Uses the same URL for both pagerank and alexa ranking.

vdwp-alexa

Simple Widget plugin to use in your wordpress installation, simply enter websites url (can be subpage) and it will display.

westondeboer

My first public plugin that shows your websites google pagerank in the dashboard. Can be disabled in the screen options menu and moved around at will.
Works 2.7+, I don’t know if it works on anything below that.
Just really an example of how to put something into the dashboard.

Dashboard Google Page Rank

This plugin shows your websites google page rank

vdwp-alexa vs Dashboard Google Page Rank