http://batts.mine.nu/downloads/slackpkgs/kde4.0.0/

check it out, and tell me where it breaks. i can not be responsible for this breaking any kind of your install, but if if does, do tell 😉

this is very, very, to me. on my wife’s laptop, it boots to a kdm console, where you can choose your session like normal, and kde4 is an option now!! and kde3/qt3 never have to get uninstalled.

vb

2008-10-28 UPDATE

i have moved these packages to  http://cardinal.lizella.net/~vbatts/kde4-coexist/

cheers ! and happy hacking