dazedgonebye
Veteran
dpreview about the e-p1: 121mm (W) x 70mm (H) x 36mm (D) 4.7" x 2.7" x 1.4"
dpreview about the g-10: 109 x 78 x 46 mm (4.3 x 3.1 x 1.8 in)
dpreview about the A590is:94 x 65 x 41 mm (3.7 x 2.6 x 1.6 in
I am actually using the A590is, and waiting to see the "G-11" as the 10 doesn't satisfy me enough to justify the buck (this is purely personal), although in terms of size the G-10 is the maximum I would go, and otherwise wait.
So, the E-P1 is smaller in 2 out of 3 dimensions. Is it too big for your needs?