I don't really like the Name/Login System... it's far to static in my opinion. In Glest we don't need special privileges for (single) user, so I don't see any requierements for registration. I personally prefer a client based, automatic ID system (like mentioned before).
Now we could only store general values like:
games-played,
units killed (in total / per faction/bot<->human),
units died (in total / per faction/bot<->human),
resources harvested (in total / per faction/bot<->human),
games won (in total / per faction/bot<->human),
points (in total / per faction/bot<->human),
botgame (game with bots, true/false),
total-highscores (highest values of all games played),
time played (in total / per faction/per game)
techtree used,
tileset used,
factions played,
...