Hey,
thank you all for your replies! This was a very helpful start for me with Linux indeed and I really appreciate very much your input! Here are my first impressions and experiences with Linux so far as well as a few questions I came up with in the meantime

I´m very impressed with the overall look and feel of Linux, particularly Ubuntu 8.04 x64 and OpenSuse 11.0 KDE 4 x64 (I´m going to have a look at Linux Mint and Mandriva as well in the next couple of days). I was surprised how well they are organized in terms of GUI (I even asked myself why people pay for windows when they could have so nice organized OS for free

). Everything one needs is just there where it should be unlike windows where one has admin tools, control panel and so on and so on...you know what I mean

I decided to try out Ubuntu installed for now. I had no problems with installing it, it´s pretty straightforward, fast and GRUB seems to take care about the dual boot, so no problems here, either. I was also very positively surprised by the fact that Ubuntu worked out of the box with my TP

But, frankly, I expected it to boot up a little bit faster since it´s Linux (well, it´s faster than windows at any case, but seems to me to be not as fast as maybe other Linux distros would be). Then I found out that this is a pretty common remark on the new 8.04 release. Also not a big problem.
However, the first run was not that flawless. After restarting from Ubuntu my ThinkPad didn´t boot up at all. I had to hard reboot by powering off my machine to get the boot menu of GRUB each time. I didn´t experience this issue when restarting from windows, it always reached the boot menu of GRUB. And then I did the stupid thing to wipe out the Linux partitions (using Acronis Disk Director) and easily forgot about GRUB

Of course, as a consequence, my machine wouldn´t boot at all staying at GRUB Error 22, so I simply reinstalled Ubuntu keeping in mind that the new GRUB would overwrite the failure, and so it was. Surprisingly, I don´t experience anymore the above boot issue when rebooting from Ubuntu. Strange enough.
So, having now a fully functional dual boot Vista + Linux, I came across a few things:
1. How to set up e network connection (wireless or ethernet)? I´m aware of the network utility in admin but there is also a tray icon for network connections and they seemed to me to differ from each other. As to the wireless connection I put all necessary data in the boxes but no success with internet, so I assume the connection wasn´t successful. I think there is no issue with drivers or so since I can recognize all networks in the neighbourhood. As to ethernet, I plugged in the ethernet cable and tried both automatic and static ip config, but still no internet. So, probably, I´m missing something here

2. Is there any way to get the hotkey features and onscreen display working under Linux?
3. More general: how about power management under Linux? I saw it there, but how does it cope with TPs, are there any specific things I should be aware of regarding power management under Linux since I´m using a laptop?
4. How about Active Protection under Linux?
5. is there any way to make my Trackpoint usable under Linux?
@crashnburn: I read somewhere that Mandriva is a preferred distro for scientifical computations, but since my TP is not a supercomputer (although it´s a super computer for me

), I guess it doesn´t really matter.
@lightweight: My impression is also that there are a lot of guides to Debian resp. Debian-based distros and that it´s actually not complicated at all to set up VM or RAID

Thanks also fir your piece of advice regarding program languages. As to LaTeX, MiKTeX is a must-have for me, but it doen´s substitute my Office 2007. I don´t like OpenOffice because editing documents (spreadsheets, presentations etc.) done in MS Office and vice versa are not always flawless. I hear a lot of people complaining about OpenOffice when receiving some documents from windows pr resp. linux users, edting them and sending them back, how they are formatted etc. But frankly I don´t have any experience with OpenOffice under Linux (I remember I tried it some time ago under XP, and I wasn´t very impressed with it). Also things may have changed a lot with newer releases.
Having said this, how about IBM LotusSymphony. AFAIK there is an edition for Linux, right. Someone tried it already? (I tried it out once under Vista, and it was not very fast, it´s written in Java if I remember correctly).Are there any good substitutes in Linux for Adobe Acrobat
Pro?
@GomJabbar: Thanks for the overview! It was helpful for me. BTW, I don´t mind working with command line provided I know how to do it
Almost forgot to mention: I´m also very pleased with the fact that Ubuntu can recognize the NTFS partition of windows and can work with it
Cheers
Marin
IBM Lenovo Z61p | 15.4'' WUXGA | Intel Core 2 Duo T7400 2x 2.16GHz | 4 GB Kingston HyperX | Hitachi 7K500 500 GB + WD 1TB (USB) | ATI Mobility FireGL V5200 | ThinkPad Atheros a/b/g | Analog Devices AD1981HD | Win 7 x86 + ArchLinux 2009.08 x64 (number crunching)