The wiki has to contain useful information, so I'd suggest some general info on Eufloria such as in the FAQ, some info on the history of it, level strategy guides (starting with L18!), answers to common support questions...
Scripting - I'd be happy for someone to put Eufloria Classic scripting details on there but it may be just as useful to simply point them at the relevant board on here, rather than rehashing it? Especially as there will be new information.
I think level walk throughs would be the most useful thing.