Started wondering again today why there's a complete lack of free ICAL servers. I know I, for one, would definately use one if it was available.
I'm thinking about starting a project myself. I've been on the look out for a server-side project to test some ideas regarding development methedologies in open source and this could fit the bill. In fact, I've even though of a name for it, "tropical". TropICAL, get it!!! Urghhh... Well, it should keep me occupied until my fuzzy book arrives at least.