It appears Fjorn and I have similar taste in software,
I load AVG on any computer where the person wants free A/V. If they are willing to pay, NOD32 is my favourite.
Ad-aware is the only spyware remover I normally run, there are so many pieces of crap pretending to be spyware removers out there it's not funny.
Firefox or opera, depending on my mood, though IE7 is loads ahead of IE6, so I usually use it for my day to day work stuff.
I'm not into images so no need for gimp, but I have used it on occasion.
OpenOffice, I load this on peoples PC's who don't want to fork out for MS-office, but I get free ms-office from work, so it I use it. OpenOffice has come a long way, but MS-Office is still a vastly superior program for most tasks. Whether it's worth the hundreds they want for it is worth it, is another story.
Some other programs,
VLC Media player
A codec pack
Nero isn't free, but it does come with pretty much any cd/dvd drive you buy.
PS - AVG does have a free spyware program too, http://free.grisoft.com/doc/download...yware/us/frt/0