Will RPi Run

Program	Will It Run?	Note
A piece of software	?	First, look below and replace "game" with "my software" . If it is open source , why don't you TEST IT YOURSELF : Get the development VM , the software source code , compile in scratchbox , run in scratchbox and qemu : If it works it'll work on the pi , but perhaps slower.
My favorite PS3/PC game	NO !	The majority of these games are made for Windows. The majority of these games are closed-source (no easy porting). The majority of these games are VERY resource intensive ( a Pi is a PII @ 300 MHz + 256 MB RAM - Note: MEGAhertz, MEGAbytes) Minecraft : no, Quake 3 : luckily yes , other games: convince the developer !
My favorite Web 2.0 / 1.0 App	?	As long there is no Flash content , of course. Might be slow. Check out the mobile/HTML5 versions. facebook: yes , Google : yes , hulu : no , youtube: yes.
Another operating system	?	"I like to code my own one :" The Pi has no BIOS , relies on binary blobs and closed-source userspace libraries for graphics accceleration and GPU/CPU bootup. Feel free to go. Many APIs available Else: Mac OS X : never , RiscOS: WIP , Fedora 14: WIP , Debian 6 : yes , ArchLinux : yes , DOS: use qemu (should be fast enough) , Darwin - you realize there is a big difference to MAC OS X ?
Windows	No	Windows runs only on x86 type computers , the Pi is ARM.
Windows 8	NO !	Will only run on Cortex/Tegra ("better" processors). Needs more RAM Only the tablet producers may make contracts with Microsoft. The producers do the porting work.
WinCE/WinMobile/ WinXYZ	NO !	Do you have loads of money to throw away (licenses + man-hours for debugging , porting , debugging again ) ? Do you realise that you won't be able to run plain Win32 .exes (no Crysis !) ? Do you realise that the primary aim is education ? - anything else isn't tested or will be accounted for (embedded applications , medical applications , rocket science)
WINE	No	Sorry. WINE is x86 only. Anything else is a pipe dream , believe me.
Netflix	No	Netflix uses proprietary technology which is not supported for Linux. There is help request against that online.
Android	?	Very propable , but NOT Ice Cream Sandwich ! Remember : 256 MB RAM ?
Java	Yes	Might be *slow* . No idea about browser plugins.
Flash	No	You can try gnash (GNU Flash) and many other projects. They are NOT a drop-in replacement for Adobes official thing.