I'm just back from a couple of months travelling in SE Asia and was having a look at netbooks myself. Some of the deals offered to me in the Technology Mall in KL were very tempting, until I realised that the machines were all Malay only models with 12 months local warranty and not a global one
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I also wanted to be 100% confident in what I was getting for Linux support but being away from home with limited net access (I deliberately took no technology other than an MP3 player - I was escaping computing for a while) I couldn't work out what I wanted before I left for home. Having returned to the high prices of the west I'm starting to think maybe I missed a chance but I've already got my desktop and it would really have been a treat.
Having done my first trip my priority for a travelling laptop would be as follows:
1. Bombproof! Your kit will get dropped, thrown kicked and otherwise abused. Seriously look at something like an
Otterbox or
Peli hard case for it. Seems like overkill but you can chain the case to the bed for a bit of protection when you leave you kit.
2. Size/Weight - I took 40l of kit for two months and wished on a number of occasions that I had taken less. I checked in 9.3Kg of luggage and brought back 10.2kg after a shopping spree in KL (I'm now sorted for t-shirts!) I'd seriously look towards the smallest and lightest you can find if you have any thoughts of carrying it further than the airport.
3. Battery - I was luck in that I had electricity and access to sockets the whole trip, that having been said a number of the places that I stayed which had free wi-fi had flakey coverage in the rooms. People were frequently sitting in corridors to get a decent signal, with no power socket. An external aerial with better gain might be helpful. Don't count on having power though and make sure the PSU will run on 120 and 230v, also sort travel adaptors before you fly.
4. Encrypt all of it! Also consider what might be restricted in countries you are visiting. It might be that they share your love of pron or it could be the death of you... they do sometimes check.
5. We might have abandoned CD/DVD, the pirates have not. If you want to pick up movies while on the road then VCD will be how it comes to you. A budget USB powered one to share could be the solution and a way to win friends.
6. Do you REALLY need it? For most of what I needed I could have made do with my Android phone. Lots of folks had iPod Touch or iPad which seemed to do them OK. Blackberrys seemed to be the king for mobile mail solutions and some of the SIM deals were amazing for data. Depends where you are travelling but most countries have Internet Cafe all over the place for reasonable prices. I used them in Thailand, found none in Laos (not sure I looked really) but did not use in Malaysia as there was just more of a dodgy vibe in the ones I went to.
In terms of models if you want old and second hand then have a look on the bay for reconditioned think pads. My landlord picked up a split mint one (I think it was stock that was never issued as the key tops are still as new) for a song. Bit big and heavy but for the price he paid I'd consider it almost a disposable item on a long trip.