first of all -of course- thanks and respect for your work!
Then to the suggestions:
The index by word should maybe be ordered alphabetically within the scope of the initial letter.
The following page when a word is often used could mention the date, if possible (so that in case you can remember the vague time you read that snippet you need now so urgently you get a better chance).
The best contributor page may also take the reputation of a snippet into account. Of course we all know that neither the rep nor the number of postings is directly correlated to the quality, but nevertheless...
And one last remark for the sorted-by-date page: If the perlmonks site will live for a longer time it will probably (and hopefully) become necessary to split the page (maybe into one document per year)
Anyway, thanks for YAUF * :)