This is a useful plug-in that allows you capture the contact information directly from your wordpress blog to your Salesforce account. Here is how you can configure it.
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(As of 2nd May 2010, using this plug-in throws an error “The email address you entered is not a valid email address” even though the e-mail address entered is a valid address”. You may want to monitor the thread http://wordpress.org/support/topic/394113 to see if any solution is found).
This issue has been resolved in version 1.0.3 of the plugin