On my blog, there is a Digsby widget that allows you to instant message me. The problem is that I forget to sign out of Digsby at night. So I come in to work in the morning and have 2 or 3 messages, but the person is gone from the website. I have to remember to sign out.
However, to cover the use case, I added in a contact form on the right underneath the widget. It’s the first WordPress plugin I found that matched my needs. I will research some more to see if there is one that is a little more fancy.
Feel free to ask me any questions. I am addicted to helping people.
UPDATE: I changed to the SMCF plugin for contact. I like that is uses jQuery. Click the link on the right and it makes a nice contact form.