A new version of the open source podcatcher gPodder is now available for Maemo 4 (Diablo, N800 and N810) and Maemo 5 (Fremantle, N900). For Diablo, the package is already promoted to the Extras repository, so it should appear as an update soon, and for Fremantle, it's in Extras-Testing waiting for some reviews and votes from you (yes, you!). Please test and vote for gPodder 2.15-1 in Extras-Testing. This is a bugfix release in the stable 2.x release series, and also includes some translation updates as well. For full details, see the official release announcement.
Because I've been asked about the QML UI several times now: It's still not day-to-day usable, and missing some features. It's also only included in the "tres" branch, and won't be included in the 2.x release series. Judging from the current performance of QML UIs on Maemo 5, I also think that the Hildon-based Gtk+ UI might be better suited for Maemo 5, especially since it has been polished for the last 1.5 years - that's why the current Maemo 5 UI will most likely still be the default, even when gPodder 3 comes out (with the QML UI as an option).
Support for Diablo will be dropped in "tres", but as there haven't been any new features for Diablo in the last several months, that's not really a problem (bug fixes will still be made to the 2.x branch of gPodder, even after "tres" is released - you just have to report them).
That said, the QML UI will be available (and the default) for environments like the MeeGo N900 DE and probably any other MeeGo UIs (tablet, handset, etc..) in the future, and it will come with some exciting new features and a streamlined user interface.