In a nutshell, the main difference is that the the A4 has a 15.4" wide aspect screen and the S2 has a 15" regular aspect screen, the S2 has a s-video out port (it doesn't look like the A4 does) and the A4 has a express card (supposed to replace the pc-cards in the not to distant future) slot (at least in US models) while the S2 doesn't.
Also, you can order a S2 with a faster 5200 or 7200 rpm hard drive while the A4 you can only order with a 4200 (but that doesn't mean you can't get one elsewhere and pop it in), there are some difference in the lower end graphics card options between the two (the avail option on the a4 are: Intel integtrated w/ up to 128mb shared emmory, ATI X600 w/ 64MB or NVidia 6600 w/ 128mb, whil the S2 options are: ATIx300 w/32mb, Nvidia 6600 w/64mb or the same w/ 128mb), the S2 you can get with or without bluetooth and the A4 does not offer bluetooth. Other than that they are pretty similar in the rest of the options and specs... but I may be missing something
Also, you can order a S2 with a faster 5200 or 7200 rpm hard drive while the A4 you can only order with a 4200 (but that doesn't mean you can't get one elsewhere and pop it in), there are some difference in the lower end graphics card options between the two (the avail option on the a4 are: Intel integtrated w/ up to 128mb shared emmory, ATI X600 w/ 64MB or NVidia 6600 w/ 128mb, whil the S2 options are: ATIx300 w/32mb, Nvidia 6600 w/64mb or the same w/ 128mb), the S2 you can get with or without bluetooth and the A4 does not offer bluetooth. Other than that they are pretty similar in the rest of the options and specs... but I may be missing something





haha but I am purchasing one for school in the next little bit. If I go with toshiba is will be the A4 or A5, or with Asus the W3V or z70v.