Update 2010-02: I have upgraded the O/S to Ubuntu 9.10 (new install) without issues. The laptop seems to have the "sleep" mode working now.
This laptop has worked with Ubuntu Linux 7.04, 8.04, and 9.10. I'd recommend it to anyone who wants a desktop-replacement laptop and will use a mouse with it. It has some issues, however, that would make it unattractive to someone who is always on the move.
Processor: Mobile AMD Sempron(tm) Processor 3400, 800 MHz
RAM: 1 GB (2 GB MAX)
NIC: nVidia Corporation MCP51 Ethernet Controller (rev a3)
Sound: nVidia Corporation MCP51 High Definition Audio (rev a2)
Graphics: nVidia Corporation C51 [nVidia Geforce 6150 Go] (rev a2)
Pros: After installation, the nVidia GeForce 6150 proprietary driver is automatically offered up as an option. I haven't had any problems with the graphics. The screen is large (15.4 inches) and "wide screen" format (1280x800 pixels, 1.6:1). It has better-than-average laptop speakers. The keyboard is large and, with a USB mouse, is a good desktop replacement that I run Apache on and don't notice any reduction in performance. When traveling, I use a USB wireless card without issues.
Cons: There are a couple issues you might consider big problems when trying to use the Compaq V6000 as a linux laptop. Two of them have nothing to do with Linux. The built in WI-FI antenna is prone to malfunctioning. I actually installed a new one only to research later how often they fail to operate in this particular model. If yours fails, get a USB WI-FI card. Secondly, the touch-pad is off-center and extremely difficult not to touch while typing. I use a USB mouse with it almost 100% of the time. Lastly, as of Ubuntu 8.04, the "sleep" mode doesn't work. If the laptop goes to sleep, you have to power it down by holding the power key down.