I am running here Mandriva 2008.1 with KDE 3.5.9, and I have set up Konqueror to idenitify as Mozilla 1.7.3 on Windows XP and now GMail works. I don’t think the chat works, but everything else seems to work. It is the old interface (no cool labels), but it does work!
Google reader is not working perfectly as well (I did not change the identification there). One of the problems is scrolling with the mouse wheel. It seems that they use an iframe, and the top frame is eating the events instead of propageting it to the internal iframe. I am seeing this on other sites. Also pressing “n” to move to the next article is not working, but space works as expected. Funny.
… and that’s the obsolete Konqueror on KDE3! now I really want to re-compile KDE4 and test Konqueror 4.1! If anyone wants to open bugs on Konqueror4, go for it. IMHO opening against KDE3 is not smart.