Everything Apple (the Mac heads thread)

I use iCal on both my laptop and iphone and have been very happy doing so for the last couple of years, and they automatically synchronise every time I plug my phone in. However life is getting increasingly busy and it would be really useful if my girlfriend and I could see each other's calendars in the same place (mainly because I'm always forgetting what I've been told...). She doesn't really use a computerised calendar at the moment so isn't tied into anything. My guess was that google calendars was the best bet but is there an easy way of syncing with iCal so that I can download her schedule onto my phone/computer and my schedule gets uploaded to the same calendar? If not is there a good alternative that we can use across devices?

I have iCal on my iPhone, ipad and hackintosh all using my google calendar account and everything always seems to be synced between the web and all devices. No extra software needed.