A few suggestions....
#1 Make sure it as a wifi card (802.11b/g). You only realize how great wireless is, when you can watch youtube atop the porcelain throne.
#2 If it runs Windows Vista, it MUST have at least 1GB of RAM. (2GB for heavy 3dgaming) If you opt for the older Windows XP, you can get away with 512MB RAM.
#3 Windows Vista Home Premium has "the pretty", Windows Vista Home Basic doesn't. Its also a quick way to check if the system skimps on RAM and video card specs.
#4 Opt for a DVD burner whenever possible. This is the easiest way to back up truckloads of photos. (Or burn your own home movies)
#5 As far as processors go... Clock speed (Ghz) doesn't matter so much anymore. The hot things now are dual-core processors. Chips to look for: Intel Core 2 Duo, AMD Athlon 64 X2. AMD processors tend to deliver more bang for the dollar, Intels tend to deliver more bang.
Heres an example of a decently equipped $598 laptop:
http://www.walmart.com/catalog/product.do?product_id=5978910#6 A $600 laptop will not be a heavy 3D gaming machine. If there is a game your kid wants to play, check the system requirements for the game BEFORE BUYING THE COMPUTER!!! If the game asks for anything more than a 64MB video card, Intel graphics just won't cut it. Look for ATI or Nvidia graphics in such case, and yes, it will cost you more.
#7 Most laptops don't have room in their cramped cases for a camera card reader. Luckily, there are card readers that plug in via USB for $20 or less. Make sure it accepts the same type of card your camera(s) use. See:
http://www.walmart.com/search/browse-ng.do?ic=20_0&ref=125875.370791#8 Unless you kid is gonna have lots of 3D games installed, or edit home movies, you can get away with 60GB. If video editing is in the cards, settle for no less than 120GB. Simple estimate: 25GB for system, 30GB for music/photos, and 5GB for each game title.
#9 Hate Vista? There are other options. Dell builds computers with Windows XP installed, rather than Vista. Only select laptops offer this option. There is also the
Apple MacBook option, which is much more expensive.
#10 Most machines don't include Office software. If they do, its a trial version.
Microsoft Office Student & Teacher edition will cost about $150. Or, save some cash and
install StarOffice for free through Google. (Compatible with most MS Office documents)
Hope this was helpful!