There's tt-rss [1] if you want to host it yourself.
Edit: It looks like I'm also happy that I chose to host my own CalDAV server, too.
Edit 2: @koenigdavidmj - Apparently I can't reply that deeply. DAViCal is the CalDAV server I'm using (http://www.davical.org/). My wife and I sync our iPhones to it and it's been a godsend for my personal organization. (Now if I could just find a decent replacement for Mozilla Sunbird...)
As of now, CalDAV is Google's recommended way for syncing with iOS devices http://support.google.com/calendar/bin/answer.py?hl=en&a...