How about those packages that seem to fall under GPL and don't provide sources?
Can someone (like the FSF) sue them to get them?
They are clearly in a license violation...

http://www.gnu.org/licenses/gpl-violation.html
It has everything you need. Basically FSF has lawyers. You could pay for your own layers and sue the company distributing it under a violated gpl yourself, but it'd be easier to just have stallman sue them.

I have two. One with SIM card - my primary and only phone. The other just a mini Internet tablet, which I used for reading ebooks and listening to music etc.

Sure, N900 has plenty of rough edges, but I'll do my best to keep these babies working as long as possible.

Yup - still using my first, operator-supplied N900, which has been my only mobile phone for two and a half years and my only phone full stop for two years (my landline is now routed via SIP).

Admittedly, it's had a preventative USB port fix, a new battery every year, a new stylus and a new set of wired headphones, but the phone itself is still going strong. I have a second one in the drawer which, so far has seen little use, but with SIM-only tariffs getting cheaper and including respectable amounts of mobile data, I'm tempted to put both of them online and carry it as a live backup.

I have yet to upgrade to a 64GB memory card and a decent set of Bluetooth stereo headphones, which would see it get considerably more use as a music player, and am eyeing the notion of a 4G wireless dongle sooner or later. I have to admit that the current generation of 4G mobile hardware is beginning to look tempting, but I had a play with a Galaxy Note II recently and, whilst I like the handwriting recognition and I could cope with it for web browsing, I still don't like Android as compared with Maemo or indeed anything Linux-based. Show me a quad-core, 4G, HD phone that runs Linux and maybe I'll jump ship, but for the next year or two (or five) I'm sticking with the N900. In general, it works pretty well.

I'm using the n900 for two years. Sometimes I want to smash it to the wall because it's so slow, but the rest of it is perfect(of course only when the repos work, what isn't the case). I can do everything with it what I want to and I like that people still create apps for it, so I can do even more.

A possible alternative would be a smartphone from Jolla, but I will use my n900 for a few years before getting a new smartphone.

In my country, Mexico, the N900 is considered a old, bulky, useless "smartphone" and, it´s extremely rare see another, live...
My life was changing with this NIT, now, i see another devices, and think: HA! Your Xperia Don´t Aircrack-ng...
BUT, i know if i break something in my NIT, may be difficult get parts for it...

Still my main and only phone (since early 2010).
Everything working on it (never had any problem). Flashed, played around, dropped... The perfect phone.

The only thing that is a bit behind is the battery now. I think I will consider changing it (even if sitting idle my phone can still be up for 5 days +).

Still using mine as my primary and only phone.

They don't last forever, I am happy with my Polarcell.

See below.
http://talk.maemo.org/showthread.php?t=65568

Li-ion batteries are said to lose about 25% capacity per year, worst case.
The lower the temperature and closer to 50% charge they are kept at the less capacity is lost p/a.

I still use it as my primary phone and WoW it's great.