What is SearchLog? At its simplest, it is a searchable weblog with a lot of features. But if you're only looking at SearchLog "at its simplest", you're missing a lot.
SearchLog is a Swiss Army Lightsaber. Where a common Swiss Army Knife has useful tools that include scissors, blades, screwdrivers, and a can opener, SearchLog is a multipurpose tool for dealing with information and ideas. Its "blades" include:
Something that can be as public as a weblog or as private as a diary.
A functional search engine over everything in the log.
Personal information management:
Address book information.
A task manager.
An interactive document repository.
A search engine that will highlight what you're looking for.
A place to keep track of ideas.
A tool to search through ideas and see what's related to what.
A flexible tool that lets you edit information while keeping an archive.
A tool to help keep an office in touch.
A portal that provides an excellent starting point for the Web.
As well as these "blades", it is designed to be "expert-friendly." It uses usability principles to try to give the serious user maximum power for minimum effort and keep mousework to a minimum.
If you're not sure which version to download, I suggest the highest-numbered version.