This page lists the details of the various hardware components of the N900 and provides additional information about how it is supported by the Linux kernel, open and closed-source binaries provided in Maemo 5 distribution.

Did you know that The 16M colors TFT LCD panel is a Sony ACX565AKM? Or that the wifi chipset supports the common 802.11 b/g but also 802.11e, 802.11i, 802.11d and 802.11k extensions? Surely not, so jump over and give it a read ;)

If you do not find the information you are looking for here, take a look at the Wikipedia page dedicated to the device, or the page available on maemo wiki.