I downloaded the UK maps.
Also, data contracts are not that expensive (circa £5 a month) and to be honest, I think most people have a stand alone GPS dedicated for driving...I'm the sort who think a Phone/GPS for driving is never going to work.
Saying that, i REALLY miss GoogleMaps on my E71.....when I would get lost in the middle of London or needed to find a local restaurant it's as simple as search on GoogleMaps and there you go....I'm waiting for the day my N900 becomes complete with a GoogleMaps widgit/program !!!!

And yes, Ovi Maps is crap as it currently stands....but with no other choice I suppose its what we have to work with.