If you are trying to get into the repository catalogs but can’t, it is because there is a known problem. I only found out today much to my frustration. I should have just visited the good folk at talk.maemo.org since they already had a temporary solution in place. In case you have not visited them yet, check out the thread titled [FOR DUMMIES] Add temporary mirrors of repo.maemo.org to N900 by thedead1440. It explains how to get around the problem and offers a whole bunch of mirror sites to the various repository catalogues. I won’t bore you with the details as they are all available on the thread, but if you have being experiencing something similar to the screen shot below then the solution is there.
Note: This is a temporary solution, so don’t go and delete your current catalogues, follow the instructions and disable them.
Image Source: talk.maemo.org
Related thread: Some repositories are already disabled!