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