The Toshiba Satellite A135-S4527 laptop came pre-installed with Windows Vista. I wanted to keep Vista for just-in-case situations with web sites not conforming to FireFox web browser, so chose to dual boot.

Basic Installation Notes for dual booting Ubuntu/MS Vista:

Install process
1) downloaded & burned the LiveCD for Ubuntu
2) Followed Dual Boot install instructions here. (or go to Ubuntu Community Documentationand search for Dual Boot). I used Vista's partition manager and EasyBCD as suggested.

Post-Install modifications/tweaks
1) The sound card didn't work out of the box. After a lot of research, installing different software, etc, I found that the answer was as simple as adding one line to a config file. From terminal run the following command:
gksudo gedit /etc/modprobe.d/alsa-base
and then add to the bottom of the file:
options snd-hda-intel position_fix=1 model=3stack
Then reboot and it should work
2) Everything else worked pretty satisfactory out of the box that I can recall.

Summary

Other than having to research the sound card stuff, this was a really suprisingly easy install. I really like Ubuntu. Other than one or two web sites that only support Internet Explorer, I haven't found a need or desire to boot to Windows Vista. I was really suprised the wireless worked out of the box. In hindsight, I probably should have chosen to dual-boot the desktop PC instead of the laptop, because I'd really like to have the entire hard drive for Ubuntu. I install a lot of programming/server related stuff just to play with so the more free disk space the better.