What software do you use the most.

I been using windows XP and cubase LE and sonar LE along with the hard disc recorder when I started to use computers for audio recording. But when I got the sixth vira and had to reinstall I started using linux instead. I found 64studio and besides the learning curve there is much good software for audio recording in linux. What I find the most useful is hydrogen for drums. it is much better than any other solution I come across because it sounds alrigth and it is programmable very easy and intuitive. I use ardour and to me its very simple using instead of the others like traverso or gnu sound as example. But still sonar which I used a lot is the software I know the best up to now. There is a possibility to make a redbook master CD with linux and this is to my knowledge a expensive peice of software for the windows platform. the missing things is the VST instruments I know from cubase and there is really t much for the keyboard I think. all in all I have reinstalled windows xp and sonar/ cubase to make some use of the things I can get from these programs and plan to use both platforms even I would prefer using just linux for various reasons. I would like to hear from others what software is most used. also what you do with it. I am just recording demo tracks when I wrote some new songs. to me its fine as long as it can do that.