Basically this is the problem I have:

When I go into app manage, I click on update. This takes about 5 mins to update but then I get the "some applications failed to refresh". So when i click in the application catalogues the maemo extras, extras testing and the extras devel repositories are all working fine, but the bottom two, namely "Nokia Applications and Nokia System Software updates" catalogues has the "failed to refresh" beside them with the (!) icon before it in red?

If i click either of these none working catalogues i get the catalogue details(which are filled in correctly) but at the bottom is some red text with "resolving host timed out: downloads.maemo.nokia.com"

So therefore I cannot get these to work and obviously I would like to have things working so if anyone could find out for me or point me in the right direction that would be great, as I'm a newbie when it comes to smartphone etc.

Thanks guys.

I am having the same issue, but I have not flashed my device yet. I think, mine messed up after installing few apps from extra devil.

First try to disable the extra testing and extra devil repositories and then retry again.
If dosen't work, follow this note. May be usefull
http://talk.maemo.org/showthread.php?t=46727

I will also try this option, from home tonight.

Cheers