Diary software

I'm still learning loads about working for myself - and what's involved in each project. It's been suggested that I keep a diary of my projects - writing notes on each one and what's involved, what I've learnt, how I feel about them etc.

I was all for doing this in a hard-backed A4 notebook I've got - it's just sitting there waiting for something to be written in it, and after hearing an investment fund manager proudly talking about getting through his 50th notebook on the radio the other day there's some kind of romanticism about the idea. Problem is, most of the information I have is stored electronically - and ideally I'd like to link to documents, emails and so on.

If I was a big company with a server and all that sort of stuff it would be easier - I'd have a web-style intranet using a content management system and set up a kind of blog on it. As it is, I have a PC, and a mac, although most important bits are on the PC - or at least final documents can be moved over to it easily enough.

So - any ideas for a cheap (free if possible) blog-type bit of software to keep all my project notes in one organised place?