It took me a while, but I finally jumped on board the evernote bandwagon.

i was happy with the built in notes.app for my iphone and I was happy syncing it via gmail to my mail.app on my mac.

i got an iphone 4s, and donated my iphone 3gs to my girlfriend. who uses windows.
i looked for a solution for her to be able to use the notes.app and sync it with something in windows.
it turns out that you cant :(

so I installed evernote on her windows machine. and on her iphone 3gs.
perfect. she can now have a consistent note taking and list making app cross platform, she can use it at work, and on her laptop and on her phone.

but I use linux at work. its ok though, because you can use evernote in a browser. and there is a linux client too [nixnote]

so now I have evernote on my iphone 4s, on my macbook pro, on my linux machine at work and on my ipad. all synced with the same notes. for free.

i cant recommend it enough, so give it a try if the notes.app isnt enough for you.

evernote.com