In case you did not notice the http://www.skeiron.org/repo mirrors, try these repositories from this thread http://talk.maemo.org/showthread.php...hlight=dummies . If even they fail on you, you could browse the repositries with any web-browser and grab the packages you want, and try to install them.
Just click them in your file browser on the N900. If this fails try to install from the X-Terminal, butyou will need rootsh installed for that: This will not just fail, but tell you, what dependencies (additional packages) you also need. Grab them also and look for the terminal output. Try to fix the configuration of packages at the end with