Well right now I'm using about 80% of my RAM all the time, and I've got more than 3gb already... so yeah I would like to upgrade:)
Software that I can't live without:
Find and run robot
Copernic summarizer
www.copernic.com (check the trial)
Copernic agent
www.copernic.com
You can actually get it for free (from the creator) here
http://www.copernic.com/en/products/desktop-search/bundle/bundle-agent.html
I don't use desktop search though since windows search is now so well implemented
Anki
http://ichi2.net/anki/
Bs Player
http://www.bsplayer.org/
Gomplayer
http://www.gomlab.com/eng/
An archiver preferably powerarchiver but winrar and winzip are okay to, even stuffit is okay.
Doublekiller
http://www.bigbangenterprises.com/en/doublekiller/
Scanitto (actually blindscan because I use a scanner from a different computer in my network:), but it comes bundled with it)
http://www.masterslabs.com/en/scanitto.html
Blindscanner
http://www.masterslabs.com/en/blindscanner.html
Total Uninstall
http://www.martau.com/
Microsoft word:)
Opera
Firefox (or to be  more precise Pale moon) www.palemoon.org
Nuance omnipage or Finereader or any other good ocr software because I need it for work.
http://www.foobar2000.org/
Editpad or ultraedit or something like that
http://www.editpadpro.com/editpadlite.html
ESET smart security 4
http://www.eset.com/
Chameleon startup manager
http://www.chameleon-managers.com/windows-startup-manager/
evernote
www.evernote.com
Miranda
http://www.miranda-im.org/
Flux
http://www.stereopsis.com/flux/
Firebird 2.0

Actually its not firebird but a software that I need for work, it's required for the job I'm doing now.
You can just check if it will run and startup.
http://www.norcom.com.pl/download/nfz/Instaluj_GlobalZPO_Demo_1_6_7_0_z_Danymi.exe
It's for creating documents for the polish public health care fund
The licence for it was pretty expensive and I would be sad loosing it.
Minilyrics
http://www.crintsoft.com/
Point motivator, ProcessTammer, instant boss,
www.donationcoder.com
A VNC client, any one will do.
xyplorer or something like that
http://www.xyplorer.com/
Proto
http://miechu.pl/proto/
Everything
http://www.voidtools.com/
comicrack
http://comicrack.cyolito.com/

Oh yeah and nero and website watcher, ad muncher, direct folders and sandboxie

I also wanted to try some other desktop search software, Archivarius and dtsearch.


And I also like to try out all the newest software, but I don't think this will really be a problem.

Hmm.. I see can someone recommend (I actually would rather have propriery  one since I tend to trust more things I pay) program that backups  the settings for all programs not just certain selected ones? Or a program that would help me with my backups and reinstallment to windows 7 64 bit?

I mean I know windows easy transfer will help me to backup my configuration files and  document folders, but is there a program that can backup whole installed applications for migrating to  a 64 system? It can be shareware/pay to use. I don't mind paying for quality:)