- Packages Tracking System — gives almost all information concerning a source package (maintainer, available versions, number of bugs, etc…)
- Buildd Status Pages — build status for the package on each architecture
- and sometimes Popularity Contest numbers
A few days ago, I remembered that I was already using GreaseMonkey and thought : "Hey, it would be nice to hack quickly something using GM to add the missing links". After a few tests, I've come up with a (very simple, yet extremely useful to me) user script that I called Debian BTS extra links . It adds what I've been missing for years. If you are lazy and don't want to install right now, you can check the following pages to see what it adds:
Of course, I've submitted a bug (#679282) against the pseudo package bugs.debian.org kindly asking its maintainer to add a link to (for now) the PTS. But I know that they are busy so I'm not expecting a result soon. Fow now, my simple and dumb userscript WFM.
 This is partly true since it links back to the PTS on main pages (pages that list all bug reports of a given set of packages).
 Only tested with a recent Iceweasel (from experimental) and Chromium (from unstable).
P.S.: If you do wonder, #4300 is the least bug number known to the BTS. Well, or at least, the result of running ls -1 /srv/bugs.debian.org/spool/archive/00/ | sort -h | head -n1 on bugs.debian.org.