Samsung Galaxy Tab vs. the iPad: Compare For Yourself - PCWorld
Nice specs, and it's cool that it has an sd slot. Based on the Galaxy S phone, it should be a solid device. The only disappointing things I can think of are the size, and if they really do tie it into a Verizon contract. Not everyone wants a 3G tablet; it's not quite like a smart phone.
I think the larger sizes they'll come out with later will be more of a viable iPad competitor.
I think 7" is just right for a tablet, personally. I'm hoping there is a WiFi only Galaxy Tab, if there is, I'm totally in.