Sure, nowhere near as extensive (and hence accurate) as my weapon or other armour info, mainly because it's easier to get high stats, and I've been lazy about record keeping lately, but here you go.

Averages (41 recorded data points):
Cutting: 36.7561
Blunt: 37.1951
Total: 73.9512

Maximum appears to be around 50 (actually obtained 49).

Anything over 37/37 is good - typical sales for me include 40/43, 37/41, 37/47 - depends largely on what you're after. Some people like a nice blunt protection shield, due to that nasty thing Bonecrushers can do that nixes shields. Others like balance, or a cutting bias. I wouldn't go for anything under say 35/35, myself.

As always, the skill 'trueshield' in combat is essential for shield-users - it means that you get some all-over protection benefit from the shield, instead of just having it protect that arm.

Hope this helps!

great now edit the first post so it includes that data

Just thought I should mention that you only get an average of around 34 with leather IF you have a Hammer. Otherwise it's more like 25. Dunno why, just what I noticed.

Oooh, just saw this thread.

Greatshield stats over 50 are possible. I once had a 52/28 forged for me. Never seen one since, sadly.

Pay me 1 credit per hour and you will. *waggle*