It would be handy if the task tray icon indicated if there was any uploading and/or downloading activity occuring. I suggest the space above the X be green if an upload(s) is occuring, and yellow if not. Active downloading would be indicated by the same colors in the lower part of the X.

This feature would help me to know when it is safe to exit Xolox without disrupting any up/downloading. As it is now, I have to bring up Xolox and search through the download status column, and this can take time if the load on my CPU is high.