A fast updating home page that loads achievements from players as they happen or gets uploaded would be cool - like a shout out wall or forum page. Gaaark the orc barbarian has entered xxx ancestral tomb, Wilfred the woodelf mage has been named nerevarine, Kaz the argonian scout has found the backbiter bow, Toby the breton thief has reached 15th level, Bob the high elf warrior has completed the xxx quest... etc etc etc. Colour coded for world/lore events vs game mechanic things like leveling, or make the choice a toggle to see either or all. Lots of options I guess.
Was my initial thought. The page loads the little entries, you click on them to check out the character involved and all it's associated data. The entries could also be added to a history of achievements perhaps so you can see what the character has done. Would hopefully mean you get to see a cross section of players as they do stuff and not just the best characters at the top of lists.
If that's not poss then something that lists characters as they get updated, for the same reason as above, so we can see a cross section of characters being played.
Other ideas...
Random idea - I've a long time player of rogue like games. If it was possible an iron man top score list would be cool too although probably not very high on the wish list for most other folks plus you only get added when you either die or 'win' which would need defining for MW.
Ahh more realistically, yes sortable lists by race, highest level, HP, magica etc would seem to be obvious choices.
If you can come up with some sort of formula to combine all the factors that make a character and therefore rank them then that would be best overall list.
Finally some stat type things showing numbers or % of character races/specialization/class/mods used etc used would be some extra gravy I guess.
Whatever you decide it will certainly be interesting and fun, good luck with it all.
:)
-KWM