It would be so blooming cool if there was a portable app that incorporated an IDE with built in compiler and tools. My personal favorite would be tcl (interpreter) with Tiny Tcl/Tk IDE or NASM-IDE with NASM. Eclipse and the other new IDE's are too bulky but a nice slimline IDE compiler/interpreter set that runs from a USB/portable device would be so, so, so cool.
Anyways keep up the good work, love all the existing (use a lot of them too 
ppp
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I've got Eclipse Portable over here.
https://portableapps.com/node/18591/
You need Java in X:\PortableApps\CommonFiles\Java for it to work though.
But I don't know any other Portable IDE's that aren't bulky... (ECLIPSE IS NOT BULKY!!!)
It's Java and thus is slow in nature because it has to talk to the processor via the JRE and most probably requires JDK as well, even the installed version takes and age to load on older machines.
It also does not have any support for decent languages ( my opinion of decent of course), like assembly or hex.
Hexplorer ( http://hexplorer.sourceforge.net/ ) is a really good portable hex editor and light as hell but who wants to be programming in hex all the time lol.
Here some collection That I personally use and Love,
it make my life so easy and much more portable
Like Visual Studio of Microsoft with all the cool features BUT free and open source.
for C#, VB.NET, Boo, IronPython, F#
http://www.icsharpcode.net/OpenSource/SD/
for C++ and for Windows and Linux
http://www.codeblocks.org/
for Pascal and Delphe
http://www.lazarus.freepascal.org/
All this program are Open source and free.
to make them portables for USB drive just search in there forum, all of them can be portable!!!