I use an hp zd7000 laptop for both travelling and at home as my computer.
She's a 3.4GHz HT P4 with a 17" wide 1650x1080 display, 1GB RAM, 80GB HDD, DVD+RW, and 802.11g wireless. Sucks batteries like there is no tomorrow (I take two for transcons and three for international), but she's fast and DVDs look so beautiful on it.