I have been fiddling with Ubuntu 8.04 on my Acer Aspire 5100 laptop for quite some time now. The experience has been very pleasant.
All the hardware has been detected out-of-box and is working properly. Graphics Card (ATI Radeon Xpress 1100) is detected o-o-b, but had to install the latest drivers from ATI, to get Compiz working properly.
No problems with sound, synaptic (touchpad), etc. Have even been able to get the special function-keys working. Even the multimedia keys on the extreme right are working (atleast in Gnome).
The multemedia card reader is also working by default.
The webcam is also working, though camorama still doesn't connect to /dev/video*. I am able to use the webcam in other applications like cheese and Skype. Cheese can be installed directly using apt-get.
The latest version of Gammu even detects my Sony Ericsson W700i, though it doesn't read contacts from the SIM card.
Sleep/hibernate functionality is available.
All said and done Ubuntu is working out to be a rock-solid distro, that is able to utilize the full potential of my laptop.