First , i like to say i love my new Aspire one (d250) .... As soon as i got home with it i hurried back home to install ubuntu 9.04 ! And it worked perfectly right out of the box
... But then ! I decided to install World of Warcraft (using wine) . I play wow with my desktop in Linux for year without problems . So i was thinking , it will also work with the aspire one . Hmmm, not really ! I got the game to start and all but it was unplayable . So , after many , many try and recompiling kernel's and trying to fix the intel driver , nothing worked ... 
I don't use windows , but i really wanted to play wow with my new aspire , so i reluctantly decide to install windows and use dual boot . Sound's easy , right ? ... Well , not so much . First i never made a recovery usb key when i first got the acer , i did not even boot windows , i when directly to Linux .
So the first step was to order the recovery disk form Acer for 20$ ... Hmm, pretty stiff price for something i thought was doing to be in the box , but since ( i admit) i did not look first or made the usb disk i got the disk and did not say a word about it . 5 days later it got to my house ! i was happy to open the package ... But was soon very angry to find out that the 3 DVD they send me where made only to be use with a external DVD drive ... I scream a few not so nice word in the general direction of Acer ... How can you send a recovery DVD that does not make a usb key recovery for a machine that does not have a DVD drive is something i clearly dont understand .... I was piss of !!! . So i took a talk to my corner hardware store to see how much was a external drive .... 58$ .... I could not beleave that Acer solution was to get the customer to pay 58$ for a external drive !!! ARGGG!!! So after thinking about it , there is how i solve my problem , without having to spend the extra money !
1- I open my acer to discover it was a sata drive (i have the 160g one)
2- I open my desktop ( witch as also a sata drive)
3- I unplug my sata drive (from the desktop) and plug the acer sata drive
4- I used a ubuntu live cd to boot and to partition my hard drive (using gparted) . (50g for windows (fat), 512 linux swap , 30G for /, and the rest (about 80G) for /home)
5- I rebooted
6- I used Acer recovery disk to install on the fat partition (not worry about the change in size... )
7- Reinstall my hard drive in the Acer
8- Now that is the important part ... If you try to boot the machine , it will give you a error 17 (or something like that ) . But it not a problem because grub will fix that 
9- I made a usb pen drive installation of ubuntu 9.04 (dont use 8.10 because network will not work) If you are looking how to create a bootable pen drive i strongly suggest using unetboot It is really and amazing tool !
10- install ubuntu (making sure i dont erase my windows (now a ntfs partition) )
11- Voila , you can now use the Acer in dual boot .
I install later WOW and it played really well (have to but the graphique detail down a bit) but now i can work using Linux and play WOW . Aldo if ever i can get wow to work in linux on the Acer , windows will be the first thing to go !!!!
Ps i made the very small guide for people used to Linux and hardware . If many people need i can maybe do a longer and more detail version . Other wise you are welcome to write