I would like to know have any of you made an app for apple before (for ipod,iphone,ipad ) and what program you used

Yes, several. I made them using Objective C (Apple's programming language of choice). Their development environment is pretty nice: XCode. It has Interface Builder integrated into it these days and sports a pretty good debugger.

Did they make any money?

Oh, nice to have an iOS dev here! I have a question for you.

I'd like to try developping iOS apps, but I'm far from being into Macs. Is that possible to work on iOS apps on Windows or is a Mac absolutely necessary?

Yeah. Not much though. They were rather niche music/audio gadgets so I didn't expect a big audience for them.

I'm still pondering a real killer app ofcourse

Added after 3 minutes:

I'm not fully up to speed on the latest status of third party development tools (like exporting to iOS from Flash), but last I checked you had to use a Mac for it.

I didn't mind making the switch from Windows to Mac though. I was considering going over to the dark side anyway and I haven't regretted it.

What I first did was buy a cheapo Mac Mini for a few hundred Euros. That's an investment you'll make back in a matter of days/weeks/months depending on how well your apps sell.

A Mac is required to use XCode, but I'm not sure about other programs. XCode is $99 while an iPhone emulator is $5.