You know what would be great? Any text added less than 24 hours ago appears in a different colour, with a red background perhaps. No ifs, no buts. Wouldn't that solve a *lot* of problems?
Great idea! Go code it ;-p
Shouldn't be hard, all the code for diffs already exists. It just a matter of parsing the wikicode in the diff, rather than printing it as source code, and obviously the parsing code already exists as well.
I think the Stable Version feature that is being worked on is a better solution, though. It's more flexible, but does pretty much the same job.