2 things I came across while playing with the Archives (from the button on top of the site):
1) The tags don't seem to be up to date. The only text that has been tagged since April seems to be the strip titles, whereas before the text inside the strip and the characters that appeared in it were also tagged. So for instance "Gabe" and "Tycho" return strips from April as the most recent.
2) There's one tag that causes an error- apparently "don't" has an invalid character in it.