Haven't seen this deal around on here and can't find anything nearly as cheap when googling about.
Next cheapest is £560 from Pcworld.
It is the iPad1 but it's brand new and the iPad2 equivilent is £659.00. The same money for an iPad2 wouild get you the 16gb wifi + 3g.
I will leave it to you to decide how good of a deal it is. I think it's very good, but personally still think I'll get the iPad 2 16gb 3g just because I know in future the potential of the 2 will have opened up more with more fancy app's running on it. However, makes a great saving for those who can't do with just 16gb and is like me, thinks £660 for a tablet is too steep.
Hope its of help to someone.