If you need a cheap laptop for every day tasks such as web browsing, email, word processing, watching movies and listening to music the Aspire 5315 fits the bill.
Hardware Specification:
Very good value for money. 1.7Ghz Celeron cpu, 1GB RAM, 80GB hard disk, wifi, dvd burner, and a bright and clear 15.4" lcd screen (native resolution 1200x800). The ac power supply brick is small and light. The battery lasts a couple of hours in real world application use.
Build Quality:
As far as build quality goes, the outer case feels a little plasticky and light, and so may not be suitable if you're looking for a laptop to use on trains and in cafes etc. The keyboard feels soft and doesn't have much bite when you type. I prefer a harder keyboard myself. The screen occasionally makes a ringing sound when the battery is recharging from the ac. It's clear that some corners have been cut as far as build quality goes to bring the price down.
Operating System:
Vista Basic. This is the only real negative. This and the Acer Power Management Software (which you must run to avoid overheating and crashing when resuming from sleep mode) consume a very large chunk of memory. I would strongly advise adding another 1GB of memory to get best performance, and possibly upgrading to the premium version of Vista.
Linux Compatability:
I ended up wiping Vista and installing Ubuntu Linux 7.10 instead. The Atheros wifi and the sound card weren't detected upon install, but I had them both working within a couple of days after reading the Ubuntu forums. Getting the sound to work was a matter of typing a couple of lines into the terminal, and the wifi was up and running after using the windows drivers via ndiswrapper. I'm a linux newbie and managed it without too much trouble. This is a very good laptop to buy if you fancy dipping your toes into Linux.