According to the phone's manual, you're supposed to stop charging it once it reaches full. This fits with many claims out there that leaving a modern rechargeable battery on the charger at 100% for "a long time" is bad for the long term health of the battery. How bad? Is this really true at all? I don't know. All I know for sure is what little it says in the manual about this. Given that the battery is non-replaceable, I'd like to keep it in the best condition I can. Who knows though, this strategy could actually be making things worse by making it go through more charging cycles than it otherwise would.
With my previous phone, a Samsung Focus S, I would throw it on the charger every night, take it off in the morning, and leave it plugged in sometimes while doing intensive stuff. It had a removable battery which I replaced after about a year due to what I thought was a noticeable decrease in capacity. I don't know for sure what was going on with it but, just in case, I'm trying a different strategy this time around.
A toast notification on Windows Phone is shown as a blue bar at the top of the display. It generally appears at (or as near as possible to) the moment an event of interest occurs. It includes an app icon and a message. You can tap it to open the related app. If you don't, it goes away on its own after a few seconds and is gone forever. There's no way to see it again. If you happened to be looking away for a few seconds, you'll never know what it said. You might not even know that it ever showed up if you didn't hear a sound. It seems to be Microsoft's view that the little numbers on the live tiles are supposed to be an acceptable substitute for a UI that shows a history of these notifications. This is one of the main gripes that a lot of people have with Windows Phone, and it doesn't seem to be getting addressed in the next release (GDR3).