If it is for work, then graphics power is not important, so we're talking business class. It should NOT have shared VRAM. Output ports are important, he should be able to hook it up to a bigger screen or a projector.
I would get something with the mobile Quads, Q9000 for example, true it's got a lower clock speed, but two extra cores do make a bigger difference in business applications then the extra clock speed of a dual core.
8GB or RAM is a must for database/server jobs, even if they are only temporary demonstrations. I would get a 17" or a 15". He should think a lot before buying how mobile he wants to be. I have a 17" Inspiron and at times it feels heavy after a full work day.
Don't get a laptop with a desktop Quad, it will be very heavy and the battery will be gone before you can finish a sandwich.
If he has the money one or two SSDs are a must. There are laptops (17") that can carry two of them in RAID0, or maybe one SSD for speed and one normal, slower but larger HDD for storage.
In the business world presentation is important, so you can only get something like Lenovo (IBM), Dell or HP. Anything else and you're not a professional.
The Lenovo W700 looks sweet and expensive if he wants a Quad, there is one with QX9300 @2.53GHz. If he'll go with a Dual Core, the Lenove W500 will serve him well, for a lot less money.