Alternatives to AllMyNotes I use (or have used) are:
Keynote (both the original from Marek Jedlinski (AKA Tranglos) and the NF (for New Features) taken up by Daniel Pradov after Tranglos declared a "hobby programmer bankruptcy, a writer's block, an intellectual meltdown to incapacity".
Original (Still available but quite old): http://www.tranglos.com/free/keynote.html
Daniel Pradov's version: http://code.google.com/p/keynote-nf/
Evernote (both the new (limited when free) 3 version and the older version 2).
I'm fortunate to have kept a copy of version 2 from my old computer as this is the one I use (and like) the most for its capacity for text, graphics and HTML (Web page) abilities.
The two programs Ashraf has mentionned are flawed (for my use at least), Cintanotes is too simple and only text oriented and FruitfulTime Notekeeper is an end-of-line product (no longer maintained) which I have tested and found so intrusive (it would insist on loading at Windows startup with no way of telling it not to) and was so awkward to use that I just gave up on it.