There is an app called MyLink that can sync all of your Lotus Notes stuff like email, calendar, contacts, to do etc…
I know some people are syncing via google calendar, but if I did that at work I would be fired for sure, lol
At the moment the only options I have found are too expensive and very limited…calendar and contact but no email for $100+ a year!
I work for Vodafone in the UK and there are a ton of people looking for this kind of functionality. We are looking into this at the moment and there is an application out now that will sync everything mail, calendar, contacts etc… from Wave Global called MyLink.