I've seen a lot of people asking around for a good laptop to run Haiku on. Well, actually, it's a netbook. It's been confirmed in a couple places, and tested by myself, that the EeePC 900HA/HD are almost fully compatible! The whole EeePC family probably has similar capabilities under Haiku.

What works:

• Fixed disk (SSD and 2.5" mechanical hard disk)
• Sound playback
• Video card
• Touchpad & Keyboard
• Internal Card Reader
• Mounting drives. Tested: Ext3 (R/W), NTFS (R/W), FAT16 (R/W), FAT32 (R/W).
• LAN adapter
• Wireless Card (using Colin's stack & driver: unencrypted connections only). Note, other laptops & wireless cards supported under the driver.
• Battery Status (enable ACPI by removing # in /boot/home/config/settings/kernel). Intsall the deskbar applet 'battery status' so you can keep an eye on your battery's level. Caution, enabling APM will cause kernel faults.
• Dual Boot with Windows.

What doesn't work:

• Webcam
• APM (advanced power management)

I couldn't really care about the webcam, but APM features like sleep & hibernate I miss.