Last time I looked, the only webcam program I could find that sort of worked for me was Cheese - which is a Gnome application. I don't mind running Gnome stuff but I do like having KDE programs to use with KDE.
I checked again today and ran into Kamoso which is working really well for me. There really isn't any lag, it saves videos and photos very nicely. It's super slick.
I never did get Cheese to properly record video on this machine - but I do have the video card in there now so maybe it would work fine too. But I was really surprised by how snappy Kamoso is. Very nice.