I love all the graphs and stats that garmin connect gives me. One issue I have is that the graphs have a zoom in/out feature... but you can only zoom OUT from the initial view. The default view seems to be reasonably arranged so that you can see all the data, including zeros. Why anyone would ever want to zoom out from there is a mystery to me as that just turns the graph into a flatter and flatter line. I can zoom out to make 800 the top of the heart rate graph. I'm pretty sure if I ever hit that, I won't be around afterwards to upload the data to GC so it seems like kind of a useless feature right now.
However if I could zoom IN, that would be a different story. The zero points at the bottom of the graph are usually not very interesting so they could be dropped when zooming in. Instead, it would give me better resolution on the top edge of the data which is much more useful.