Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
There is an old saying that goes "you can't miss what you never had" meaning that for those who have never had something of these things they will have no idea what they are missing out on. The following are the top ten features/programs I find myself grumbling about/missing the most when I am working on the Windows platform:
10.) Klipper/Copy & Paste Manager - I use this one alot when I am either coding or writing a research paper for school. More often than not I find I have copied something new only to discover I need to paste a link or block of code again from two copies back. Having a tray icon where I can recall the last ten copies or so is mighty useful.
9.) Desktop Notifications - This is something that was first largely introduced in Ubuntu 9.04 and something I quickly grew accustomed to having. Basically it is a small message (notification) the pops up in the upper right hand corner of your screen for a few moments when something happens in one of your programs (a torrent finishes, you get a new instant message, ect.) or you adjust the volume/brightness settings on your system.
8.) "Always on Top" Window Option -