I found a pretty good log book at a sight called
www.fishtaleslog.com. (I think someone brought this site up some time ago.) Plastic 3 ring binder type, that you can add pages to. It has different tabbed sections, for log pages, boat or equip.maint., reference for storing addresses & phone #. Even has a couple plastic pages for business cards.
Log pages are stored by month. So my number system is trip # for the year and last two digits of the year. So a trip today, for me, would be 37-10, filed under the August tab. I have been using it for 3 years, and it is just about full. I hope to get the rest of this year in and start a new one in 2011.
Each page has a lot of info on it: Location, Spot, day/date, Companions, Hours fished, GPS#, Weather Conditions (Broken down further by Barometric Pressure, WInd, Air Temp, etc.) Water Conditions, Tide/moon phase, Gear, structure, Bait.
Reverse side is for # & Type of fish caught, & Notes. I sometimes attach a picture to the page also.