Congratulations on your satisfactory purchase! I am so impressed with my N900 that it has taken the place of my laptop. I only use my computer when I have to use PC specific programs. Most of my gaming, movies, music and web browsing is done on the N900. I had so much fun playing Killer Instinct on my HDTV from the N900! It felt like it was 1995 all over again.

The N900 has endless possibilities and is the best Mobile Computer available! First thing I would do as a new user is upgrade to the latest N900 firmware: PR1.2. That will give compatibility for the newer software that rely on that firmware. There are a lot of knowledgeable people in this community and many are more than willing to help. I found most of my answers by searching through the forums and if I couldnt find it here, using google search would give me an answer...that would link me right back to maemo.org.
I hope that you continue to enjoy your N900, learn what it can do, add the extra repositories and maybe even learn xterm commands. One thing to remember is that the N900 is a Mobile Computer and that means that there is so much more potential for development and use than from a mobile phone.

This community is great and there are many developers that make software for the N900 and don't charge a dime for it.

Welcome, and enjoy!