Kaustav recently introduced me to Timeline — a facility that does for timelines what Google Maps does for geographical data.
At first I thought it was a neat curiosity but I soon realised that it could be used to give another view into my observing logs. After some playing around with the timeline API (some of the documentation is lacking so a bit of code-reading was required), and after writing an XSL file for use with Sablotron that took my log source files and produced a timeline XML data file, I finally had a working timeline view of my logs.
I probably still need to do some work — I think the look and layout could be improved a little — but so far I'm pleased with the result and I'm impressed with how simple it was to get up and running.
I'm also thinking about adding some extra bits to the page: having controls that let you easily jump to the first or last observation might be handy, also having some sort of "bookmark" system for significant observations might be useful too.