The systray icons are not always well arranged, after some time using the computer, there are gaps between the icons and they waste valuable space in the panel, valuable overall in small screens like in netbooks.
This happens after open, close applications which uses the systray, suspend the computer, waking it up, etc. (after some hours of normal usage).
Please watch the attached screenshoot to understand the problem better.
EagleScreen ( EagleScreen ) - 2012-04-05 15:17:14 PDT