I've been using google calendar with mobile alerts for long and i find it pretty useful as you don't need to transfer all birthdays onto ur new mobile when u get a new one, instead u are notified by a SMS and all this is free from google.
yep this is nice. Just hope google keeps the mobile numbers private and we don't start getting advertisement messages and calls.
My mobile has been registered for google calendar for long ( more than 10 months ) and I haven't received any ads of any kinds till now, but I only receive my calendar reminders . So no need to worry about it.
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do try the google calendar with mobile alerts, its very useful and always on time, i use this to keep up me with many of my TV shows and bdays too.
if u want to transfer, then using nokia PC suite , you make a backup of all the events from your phone to Outlook CSV format and then add it to google calendar, by using the add calendar button.