Vadlo looks like a good search engine for powerpoint search in 
phylogeny/classification (i.e. http://search.vadlo.com/b/q?
sn=158621799&e=dta&k=phylogeny&rel=2). there are software and tools too.

also cartoons (http://www.vadlo.com/Daily_Research_Cartoon.html).

-Anne

----------------------------------------------
CLASS-L list.
Instructions: http://www.classification-society.org/csna/lists.html#class-l