What are you looking for dude? Features , Price?
I've gone through an IBM Ideapad, HP Mini10, and now have the Asus T91MT Netbook/Tablet in my Sig. (Edited in better picture since the other one was box closed);
http://www.asus.com/product.aspx?P_ID=KIqtSJ1aVsmVpeqS
The only drawback is that at 9" the keyboard is a bit small, and with the new updated N450 and the future faster CPUs I would prefer to have gotten the 10" model which is a little faster and a little bigger;
http://www.asus.com/product.aspx?P_ID=xK9O0XZhFswxrTrn
Now that's $500 CDN, so slightly more expensive than a typical netbook, but I think you'd agree it's also got more features too. The multi-touch screen and touchpad along with the swivel tablet make it hand for things like flying (took it to Winnipeg 2 weeks ago perfect size for the seat-back trays) or for lounging around.
Now for the CPU like I said I would prefer the N450 over the Z520 I got (even though min does have better virtualization and HT support, the N450 is 64bit and faster 1.7 vs 1.3 Ghz, and better for video since the GPU and memory controller are on die and a little faster). But it's still more than enough for surfing the web although it does have a smaller than 720P screen (1024x600 as above).
I would say
AVOID the N270 & N280 & Z510 as they are slower than the N450 and Z520. There is a new N490 and Z540 coming, but I think they are a few months away. IMO for flash the N450 is the only option in a netbook as it's a little bit slow on my Z520 sometimes if I have something else running. The nVidia ION solutions are a good idea, but they are a little harder to find in netbook form rather than mini-notebook form (11-13").
Get at least 2GB IMO simply to avoid chaching, Win7 is better than Vista but still needs a bit of memory and 64bit is a bit bigger footprint on memory too.
I like having the SSD 32GB (with 16GB of SandDisk Extreme III 30MB/s and 500GB WD Passport Studio), but a good size HDD is likely the better option for your daughter.
Get the 6 cell battery if it's not too expensive vesus the 3 cell, it makes it easier for someone who isn't in the habit of plugging it in all the time (I treat mine like a smart phone, and plug it in when not in use).
Look for expandablity options, and look for good software (Home premium 64 vs Home Starter as a start).
Also get the 2GB it's worth it.
Now the other thing to consider is the cheap 11-13" celeron, ION and Turion laptops which are now runnig around the $400 range, which is nearby the cheap netbooks, and really the keyboard size and CPU power are night and day, but they are heavier (I wanted ultra light as it goes to work and on the couch [usually type in the forum on it now, but currently on my work laptop {multitasking}] so those were a bit big for me). The 11-13" ones also offewe a bit better resolution sometimes and also better GPUs, like the intel X4500 vs the netbook standard GMA 3150 and 500 series (500 is better than the 3150) or the HD3200 and HD4200 both of which are better than the GMA500 in my Asus.
Really, in my opinion, you or your daughter need to get hands on and see which one is the most comfortable for her to type on.
IMO, check out the T101MT it's a nice update on mine (even an extra USB) and I love mine.