FusionCharts promised log scales, for line and bar charts, and you can see that at the end of the clip. Unfortunately, the X-axis doesn't auto-format for dates. My data is stored in MySQL by UNIX timestamp which means for every bit of data, I convert the timestamp in PHP before sending it over to chart. Log scale is nice, but there isn't any zoom/pan ability for these type of charts. Apparently, only some line and bar charts with linear scales have zooming.
I didn't have any chance to pretty up the FusionChart, but I have to say, in spite of the log scale feature, I much prefer CanvasJS. I also did some work with D3 but I'll save that for another post.