I’ve noticed that packages.d.o doesn’t provide an option for searching packages in oldstable.
Maybe I’m wrong, but I’m almost sure that this was possible until recently. Anyway, is this a bug or a “feature”?
Gerfried Fuchs [ Editor ]
Please take a look at http://packages.debian.org/index instead, there you have all the options. Actually this page should replace the form on the main website and the redirect being removed, it is though still work in progress. Notice that the form on www.debian.org doesn’t contain the options to search in e.g. the backports suites neither.