List of plugins to consider testing/using

smtp - send mail directly to smtp server rather than using PHP mail
ckgedit - WYSIWYG editor
folded - foldable/collapsible page sections
todo - todo lists
mathjax - self-explanatory
~~simplenavi - tree navigation for sidebar~~ using navi
pdfjs - embed pdfs in pages
fastwiki - speed up dokuwiki
indexmenu - tree menu?
pagelist - maybe replace nspages (maybe not)
tag - tag wiki pages