I have the same laptop as you. Li 1705
Got mine from the shop with 2gig of ddr2 667mhz and a pentium dual core so i gues its a light upgrade. though with the graphical dedication i get just under 2gig.
ANYWAY... i am also to upgrade. going to put 4gig in (2x2gb) sticks
Its all very easy and you will also be able to install upto 4gig of DDR2 667Mhz. i would say the best sticks you should use are the samsung sticks orPatriot sticks
Here is a 2gig kit:
http://www.aria.co.uk/Products/Componen ... ctId=28604
Here is a 4gig kit:
http://www.aria.co.uk/Products/Componen ... ctId=28603 VERY GOOD STUFF
Installing is VERY easy!! turn your laptop off (and remove battery to keep safe) under your laptop is a removable pannel, there are 2 of them, a small one and a LARGE one, remove the large one, 7 screws is all and you will see your RAM right away, short sticks, i think with your config you will se 2 sticks, each 512mb (one over the other) To remove them just push the tabs left and right on both ends and the ram will pop up to remove. once removed simply pop in the new RAM and raplace your cover and turn your laptop on. ALL FINISHED
enjoy your upgrade!
One final note, you may have to upgrade your BIOS to the newer version, but I really doubt it for a simple ram upgrade. usually you need to upgrade BIOS for things like CPU uprades only.