and sorry for this late reply - work is killing me these days.
To the topic! So far I didnt found the time yet to try at least one
of the things you recommended me. Further I noticed my Xubuntu 9.04 starting to get sloppy. I noticed that because YouTube-Videos began suddenly to stutter, and sometimes the system isnt responding for a few seconds.
It can only be the stick, since its the slowest component.
So I decided to do it again the normal way - tomorrow I will buy a WD Velociraptor 74GB, attach it right into my machine and give Xubuntu a fresh, new and clean installation. Maybe my hardware (An Acer Aspire M3200) with such a HDD is a bit too great/fast/overdone for a simple Xubuntu, but there is nothing I hate more than a OS thats slow.
Nevertheless, after I gave Xubuntu new life on the Velociraptor, I will disconnect it, throw in the Xubuntu-Live-CD, plug in my Xubuntu-Stick, an empty stick and try the "dd"-command.
Since I then have nothing to lose. it WILL work!