The Wiki is a great idea!
I think many will be curious about:
equipment reviews -- what works & what doesn't; among what works, what regular maintenance is required, how easy this maintenance is, life expectancy, ease of locating parts for said brand; price range, difference between different price levels
cruising budgets -- maybe those with good records will post specifics (especially useful to see the newbie budget before they work out their cruising lifestyle), comparative lifestyles for different regions
experience with retailers -- this might descend into commercialism, but curious how cruisers comparison shop both at home & abroad
...I think these topics might naturally arise within the individual region & passage discussions, but I think they might deserve their own section.
If there are other websites that do a good job addressing these topics, then maybe simply a "Links" section to lead readers to them.
What do you think?