Title

Drupal doesn't give an easy way for end users to override titles out of the box -- I haven't used this module -- so use at your own risk -- but it seems as it does what you want:
http://drupal.org/project/page_title

Oh -- and you can change the title of the memetracker by clicking edit. This doesn't change the actual page title (what's within but it does change the title on the screen.

Ok, then the Page Title module should be what you need. I'll have to look at their code to see how they set the html title because that should be done automatically by memetracker.