Are there any sites that will convert simple websites (not RSS feeds) to be iPhone optimized? I'm not wanting to have to manually change a mobile version every time I update something on the main page.
You're thinking WAP which the iPhone is not. The iPhone unlike just about every other phone out there, will render regular web pages just fine.
Don't recode your web site, leave it as is to suit computer based browsing which will naturally include the iPhone. Leave the WAP browsers in their own dust.