+1 for the online blogs. Easy free and you don't have to worry about losing it. I've kept a log starting in 1995 with the hopes of one day maybe writing a book. Not gonna happen until my kids are out of the house because I'm too busy fishing or taking care of them.

I also used it as practice for coding HTML. What PITA but it was fun to look back at our adventures. www.alaskafishinglogs.com

Now I use the blog system. Unlike the technical detail blogs mine are more stories. But with the ability to upload pictures and video the conditions can be memorialized. I have no idea if it's the best one but I use the google combo of blogspot, Picasa, and YouTube and it's pretty easy. It does take time but I personally think it's worth it.
http://guidesak.blogspot.com