MiniNote vs Eee over on Pocket-lint (you'll never fit either sub-notebook in your pockets!)
Pocket-lint have a 'Can HP MiniNote rival ASUS Eee PC?' review on their site. It's a lot like comparing apples and oranges and they admit that. It doesn't help that there are a variety of flaours of both sub-notebooks.
I'm generally happy with my Eee PC 900 but I'm a bit miffed about the battery situation* (I didn't find out about this until after I'd bought mine) and that pesky stuck pixel (it's bright white FWIW). Can't wait to try out the MiniNote but I've been told I'm in for a long wait.
In the meantime I'm doing my "homework" thanks to the ever increasing articles on the tech sites and blogosphere.
*Read the following for more:
Engadget: ASUS replacing Eee PC 900 batteries with longer lasting versions
jkkmobile: It's official: Asus will replace Eee PC 900 batteries
Gizmodo: Asus Gives Reviewers Different Batteries Than Consumers, Considers Free Upgrade
and the ever vocal forum members over at EeeUser's forums on the UK situation: UK 900 owners getting the 5800 battery exchange?