http://maemo.org/community/wiki/HowToEditPosixLocaleData/
How to change the date and time formats on the N810 and other nokia tablets. It requires a scratchbox development environment.
http://maemo.org/community/wiki/HOWTO_FlashLatestNokiaImageWithLinux/#a4f6eb951c9d89a4a9027f479f3935c8
How to flash a new os onto the Nokia N810 and other tablets.
http://www.arachnoid.com/linux/nokia/
Some tips on how to hack the N810. Including a note on formatting the internal memory card due to a fault at the factory. Good stuff.
http://www.claws-mail.org/maemo/
Claws Mail is a lightweight mail client. The maemo port is specifically for Nokia tablets and supports advanced features way beyond the default mail client, such as imap folders, etc.
http://www.gronmayer.com/it/
A collection of repos for the N810 and other tablets. Includes 1-click install links to be used on the device itself. A long, long list, very handy.
http://www.navicoretech.com/Consumer/Support/Downloads/tablet/en_GB/wfnavigator/
Download maps for the Map application on the N810 tablet without using the in-built software. Very useful. :-)