I just ordered my 5g 60gb black ipod and a two-pack of martin-fields screen protectors. Why M/F instead of Invisible Shield? Mostly because I don't like the way the Invisible Shield looks when it's dry. I realize it's basically bomb-proof, which is VERY appealing, but I have a hard time with the idea of saving my sexy new ipod from scratches by covering it in something (that imho) looks about as ugly as the scratches do. So I went the M-F route. Those don't cover the sides, but that doesn't bother me; after all, i'm not going to be watching video on the SIDE of the ipod. They DO come with a back protector, but I doubt I'll use that, either. I just want the one for the front. I don't know how scratch resistant these are compared to the Invisible Shield, but I'll be sure to report on that once I find out. The other thing I rather like about the M-F protector (in addition to its being crystal clear and preserving the original sex appeal of the ipod) is that it covers just the screen and the center-select button, leaving the scroll wheel alone. I'm coming from the 3g ipod, where the scroll wheel is slightly recessed, anyway, so hopefully the M-F screen protector will give the 5g a feel something like that.
I also look forward to seeing how compatible the 5g is with my 3g's dock: I know the 60gb 5g is slightly thinner than my 30gb 3g (ain't technology nuts?), so hopefully with the screen protector on, it should fit in the dock just about perfectly. We'll see.