Wow. I didn't realize I've had my M505X for almost 3 years. And it was all because of reading this thread about 3 years ago. And yeah. I still have mine. Upgraded ot 1GB memory and 60GB 5400 RPM drive.
OK. So, I'm just contributing to say that I've installed Vista and it runs. For about a month, I was dual booting between XP and Vista RC2 Build 5744. Didn't test it as much because I still need to run XP for work purposes. (IT support)
Yesterday, I installed Vista RTM over RC2 Build 5744 and had no problems other than having use windows update to get latest drivers for wireless. What I found previously was that the wireless button didn't work, even when I've installed the latest Launch Manager from Gateway. I researched a bit and found a message about the latest Launch Manager was at Giga-Byte's site for the N601 laptop. Also, I've read that the setup needs to run as administrator and needs to be set at compatibility mode. And with that, the wireless gets activated with the wireless button. Woot!
Later, I'll do a wipe and do a clean Vista install. I still need the XP part. I have to do some support by logging in remotely at work through citrix. Yeah, the citrix client sorta works with IE7, with reduced security. Also, I use a bluetooth dongle to connect to my cellphone for emergancy internet access (remote support when no other wifi connection around). Yeah, the bluetooth part works with Vista also.
The DVD playing works, but haven't tested out CD burning. Also, will need to test battery usage.