have built a web app for myself that syncs my RTM and GCal events. It's been running on my server every 10 minutes for the past three months, to iron out the bugs.

Essentially, it's a two-way sync between GCal and RTM. If you create a task in RTM, it shows up in GCal ten minutes later, and vice-versa. If the RTM task has a time associated with it, the web app will create TWO GCal events, one "all-day" and one "timed" event. If the GCal event has a time associated with it, the RTM task will also have a time.

Completing or deleting an RTM task will delete the GCal event. Deleting the GCal event will delete the RTM task.

Edits made to the RTM task are reflected in the GCal event, and vice versa.

I've put a lot of time and work into this tool. I'm considering publishing it on a production server and opening up a beta-testing phase. Is anyone interested in this type of service? If so, please reply here.