I found a program named , AllTray , (I wonder why digg users never introduced it to people) , after installing this program you can put the programs you want in tray , by running AllTray and then clicking on the window of the program you to minimize to tray, so after that when you hit the close button , it will be minimized to tray , instead of being closed !
In Ubuntu (Fesity Fawn) you can install this program using Synaptic package manager , for other Distros you can download it here
Enjoy too !
+ Update : just a tip on using this program , do not put all your programs in tray , putting a program in tray means , you want that program to be in the Resident Memory (Ram) and you want it to be ready all the time ! (so do not put unnecessary programs in tray or it will take your ram and your computer speed)
+Update2: another tip, to make a program to be loaded by AllTray on default, you can do this :
for example for Thunderbird , go to System / Preferences / Main Menu / Choose Internet in left column / (then right click on Thunderbird Mail and change the properties
change the command :
alltray mozilla-thunderbirdyou can play with it and do some other things , like you can add that above command to System/ Preferences / Seasons (so it run thunderbird in automaticly at startup using AllTray)
alltray itself has some options which you can use them to see the full list of options type this :
+For poor Windows users , I found a similar program for them so they have some fun too (wink) it is not as cool as AllTray but still....