@David_HarrisonApr 26.2007 — #It depends, do you have anything that requires a static IP address? The chances are that if you did have something that required that, you'd know about it.
In most cases and for most things, no, you don't need a static IP address. The only thing that I know of offhand that does require one is for anonymous FTP, and I'm not really sure why it does, but there we go.
@felgallApr 27.2007 — #You will need a dedicated IP if you want to install your own security certificate so as to set up secure pages for selling from your site.