Any chance more options on the Member List page can be added for filtering members by order. You have two sidebar blocks that list "Top Posters and Newest Members". But there could do with being more than just that not used in the sidebar.
Two things that stand out most would be adding the option there to.
1: Arrange members by Post Count (high and low) 2: Arrange members by Registration Date (high and low)
But I think a lot more needs adding in the page itself - there's room for a lot more useful data on the small text row.
Members list is quite undeveloped and I normally find it useful for a summary.
From left to right:
[Age] from [Location].
Start Conversation (button)
All Messages (button)
Threads started: [no.]
LAST VISIT: [date]