I know its something been mentioned before, but for the last 6 weeks ive been testing the Clustrmap on my own website.
I can confirm that it does not take up much space, and if u click, it enlarges.
Also although you have to register to receive the code, i have never received any mail from them nor had any intrusions. I think it would be a nice addition to our homepage.
If you want to see a working example, click on the www button at the bottom of any of my forum posts. The map is at the bottom of the homepage.