occasionally apt decides to fuck with me (surprise) and this time, it complained about invalid signatures from what sounded a bit weird since it had been running smooth lately.
anyway, the error message that appears after trying to do a simple update was.
W: GPG error: http://ftp.se.debian.org/debian/ lenny Release: The following signatures were invalid: BADSIG
A70DAF536070D3A1 Debian Archive Automatic Signing Key (4.0/etch
to my luck, (as in, me being lazy) the solution was to use another mirror (in this case, dk instead of se) so it looks like the mirror was acting crappy.. and if i have had just a little more patience..it would probably had solved it self by now..