I've used erminig with greate success. The downside however is that it doesn't support scheduling.
I want my contacts synced from the N900 to evolution. I use Google Calendar for the calendar and that's good enough (in terms of UI). But having contacts synced automatically two-three times a day seems to be (too) hard.

I made an attempt to schedule this myself, but the python bindings for the scheduling framework wasn't documented enough for me to success.

I'm looking at ScheduleWorld right now, paying 27 USD to avoid having to setup a Funambol server on my own (which I've read doesn't work as well as ScheduleWorld).