Immediately after landing to Helsinki-Vantaa airport, I went to R-kiosk to get a prepaid phone number. The customer service at go mobile told me that it would cost 4 €, but as the R-kiosk web site said, it was 9.9 €.
My phone number between 26th December 2007 and 6th January 2008 is +358 41 776 41 47.
By the way, if you are looking for a place to stay in Lapland, my grandmother has a cottage there for rent.