What should I look for, or avoid, in a laptop that will run Ubuntu?

Instead of asking the question, "What laptop make/model is good to use with Ubuntu?", I was wondering if focusing on the characteristics of a laptop would be helpful. Things I am wondering about are along the lines of:

• ATI vs nVidea vs "it doesn't matter"
• wireless specs to look for or avoid
• display specs to look for or avoid
• audio specs to look for or avoid etc.

Thoughts?

Thanks!

You can have a look in this site it has Ubuntu-certified hardware for Laptops, Desktops, Servers and Netbooks

Look for

• Intel video
• Intel wireless

Avoid

• Intel GMA500 (aka Poulsbo)
• Broadcom wireless
• certain Realtek wireless chips are problematic, I've heard

I can't imagine display specs having anything to do with compatibility.

Audio is generally fine too, except bleeding-edge latest hardware may have problems (e.g. headphones jack not disabling internal speakers). Those generally get fixed in the next release, or you may hope to find a backported fix in the -updates repository sooner.