If you find something good, just post what it is and the proof, I'll add it in somewhere.
heh, define "good"
here are a couple awaiting approval:
7 unique characters h160 (the lower the rarer)
9595010971605d7961101960d715d11916661799
b2bcd8edb9b60941fb85a520b0902d5fb0e07357af890c69f8d193ef0afb209c (comp)
12/13 unique characters base58 (excluding/including leading 1 - thoughts?)
12sqRvqvsK9fs28K9s2MvMKMKR9g9vRRqb
0e456b1a5b0abe927461a047b78bc0fef8ae1ffc50f41dc6d426a0ccad4d4d53 (comp)