The initial version of the mail bloat tests is very basic and we need to expand them to cover more areas of mailnews - especially every day user activities. Rather than have a lot of bugs filed with ideas that we're never going to implement, I suggest that we add our ideas to https://wiki.mozilla.org/MailNews_Talk:Memory_Bloat_and_Leak_Tests and as we decide we want to pick them up then we convert them to bugs (I think an ordered approach is useful here). I'm happy to drive the ideas process and hence I'll own this bug. All bugs this depends on are help wanted unless already assigned to someone. I'll also make a list somewhere for when tests are extended/added and the effects on the numbers - so that when know when things change and why.
The link to wiki.mozilla.org is no longer valid, the page was moved to https://developer.mozilla.org/Talk:en/MailNews/Leak_And_Bloat_Tests in Sep, 2009.
Bloat tests cease to exist now.