Just your luck!
I got a new HP ZD7010 this past weekend and have installed Mandrake 10 OE. It was actually the easiest install of Mandrake I've ever done. (I've gone through at least 10 installs in the last 6 months on various other computers) The only issue I really incurred during this install was with the screen resolution, as this laptop has a 17inch widescreen monitor, so I actually had to go into the XF86Config-4 file to add a resolution of 1440x900. I also needed the NVIDIA kernel patch, but that was automatically taken care of during install.
I however am not using the conventional modem, as I have a cable connection and would rather shoot myself then deal with dialup internet :D So I can't help you there.
I've been up and running for 4 days now, and have not run into any problems. ( Knock on wood :P )
If you have any specific questions I'd be glad to share my experiences.