Well, it seems that those letters are shortcuts (SC) in Konqueror when you hit Control. Hit Control again and the SC will desapear, the problem is that you will see only one letter for each SC so you have to memorize the ones you like. 
Weird letters II
March 15, 2006 at 3:26 am (Debian, KDE, Open Source, Wondering)
Changing sources.list to Dapper…
January 13, 2006 at 2:50 am (GNU/Linux, KDE, Kubuntu, Open Source, Software, Ubuntu, Wondering)
Yesterday I changed my repositories to Dapper, but it broke my system and I couldn’t boot Kubuntu…lets see whats going on, I will use the old Xorg file and try to use it to start up KDE (which I think is the problem)…but I will have to wait until the evening when I come back from work…dammn it!
In order ti change it to dapper, I replaced everything that has to do with breezy to drapper…and that was it.
My sources.list ended up like this:
# deb cdrom:[Kubuntu 5.10 _Breezy Badger_ - Release i386 (20051012)]/ breezy main restricted
deb http://es.archive.ubuntu.com/ubuntu dapper main restricted
deb-src http://es.archive.ubuntu.com/ubuntu dapper main restricted
deb http://es.archive.ubuntu.com/ubuntu dapper universe
deb-src http://es.archive.ubuntu.com/ubuntu dapper universe
Or something, not sure now. At the end I had to reinstall the whole system as it crashed my system and wasn’t able to boot. Now I have it back to Breezy 
let’s wait until next release! when? well, as the Flight CD4 has been released on February 19th, I’ll have to wait a little bit more 
