If you have updated the system to CSSU testing or Thumb and have installed rootsh and presuming you do just use as a fun second phone (or 50th if you are a collector):

1. Opera 12 and update certs (instructions in thread "Devel upgrades" thread) and enable in Opera (typing about:config to url bar) TLS/SSL 1.2

2. mSoma internet radio

3. Pidgin messenger with Telegram plugin

4. BlessN900 camera (unless you want to also shoot videos which you can with default camera)

5. Mypaint drawing program

6. Picodrive and search to download for it Psycho Pinball (or I may have it or the link is in some game thread here where I asked about it)

7. Youtube-dl (I think instructions are given by user nonsuch in his N900 page and link to it in his signature).

8. Orientation lock applet (to force landscape and if you use phone also change in phone settings the landscape)

9. Load applet (to see mem plus cpu use as bars in top of your screen and with that you get also to your top bar launch menu option for screen capture and screen recording)

10. Simple brightness applet (to get in your top bar launch menu five brightness modes to use).

Ten asked, ten given. But if others have same you will not get as many as if you would ask not to name the same as other users already have done.

After you have installed all you want disable all the repositories in application manager. And then if you want to make your device faster/snappier then that is another thing to talk about: overclocking, swap/memory settings, unneccessary system load to uninstall, disabling transitions etc.

And then there is privacy and how to make N900 secure to use: iptables settings for firewall, ssh, VPN. I haven't studied those yet.

And then to share your connection or using as server or whatever.

Many things and topics you can dive into.