I know that lots of people on the 997 board have been complaining about the lack of a spare wheel. The same is the case with the 987, although I think you can opt for a space saver wheel if you are in the US.

Anyway, when I specced my 987 today, my dealer said that all UK cars would come with 1 years tyre insurance free of charge (which can then be extended for further years). In the case of a puncture, you will be able to call Porsche assistance and they'll send someone out to replace the tyre immediately (no cost). Obviously this will take longer than fitting a spare yourself, but I think it's quite a good compromise.