The little table at the top of http://ruleqa.spamassassin.org/ , and the longer
version of the same at http://ruleqa.spamassassin.org/?longdatelist=1 , aren't
a very good UI for selecting "daterevs".

(reminder: the "daterev" is the unique ID for a mass-check, combining the
mass-check time and date, the source revision of the code, and the type of
mass-check.  see http://wiki.apache.org/spamassassin/DateRev ).

I think a better UI might be something like:

  code rev    mass-checks (2)
  --------    -----------

  421549      Preflight, on 20060713       Nightly, on 20060713
  (1)         mc-fast mc-med mc-slow       bzoetekouw cthielen daf
              mc-slower [+] (3)            parkerm theo wtogami zmi [+]

  421192      Preflight, on 20060713
              mc-fast mc-med mc-slow   
              mc-slower [+]           

  420767      Preflight, on 20060712
              mc-fast mc-med mc-slow   
              mc-slower [+]           

  [...more] (4)

(1): there's a popup "tooltip" on the code rev number, which displays the
Author (who checked in), time of the checkin, and the SVN check-in message.

(2) The mass-check "blocks" are cells in a table; preflight, nightly and
weekly-net mass-checks used different background colours so they
can be quickly differentiated.   They are ordered from left to right as
preflight, then nightly, then net.  If a mass-check of that type didn't
occur for that SVN rev, its table cell is left empty.

(3): the "[+]" is the existing popup list of mass-check start/submit/size
details.

(4): further mass-check entries proceed down the page, in "recent first"
order.