One of the things why I was on the tracks for getting src:wxwidgets2.8 into the pool was to be able to get a recent pgadmin3, too. The one we currently have in testing/unstable isn't even anymore able to cope with our default postgresql-8.3 version.
Now that wxwidgets2.8 is in experimental for a while I tried to suggest a pgadmin3 upload to experimental. Unfortunately the package maintainer seems to be quite busy these days, thus I prepared an NMU for it, planing to upload it into the pool at the start of next week. All involved parties received mails about it—that also includes the bug reporters of the bugs it would fix. For your convenience, if you are interested, you can find the package in the meantime on my private server: http://rhonda.deb.at/debian/pgadmin3/—feel free to give it a test and send feedback along.