This is the condensed version of the command I wrote here.
If you have Ubiquity, you'll see a "Subscribe" button on the upper right hand part of the browser. Click it to install the command.
The Ping.fm commands pingfm and pingfm-key allows you to post to Ping.fm.
First use pingfm-key to set up your Ping.fm App key. Then, you can post as you please to Ping.fm using pingfm.
You can also clear your Ping.fm App key from this Ubiquity command by using "pingfm-key clear".
Oh yeah, here's the source code.
If you have any comments/suggestions, you can contact me at: loki [at] maloki [dot] net. You can also post them here.