My huge quest for such a tool was how I found DC. I ended up following a link from Google to the famous
note taking discussion.
I never did find
exactly what I wanted, but
Developer's Tips & Tricks is about as close as I have come.
I believe it is portable and can be run from a usb thumbdrive. He has both an installer version and a .zip version available.
What I like about DTT is that it doesn't store the snippets in an actual database, and it creates files within its folders with the same directory structure as in the application, with the proper file extension for the particular language of each snippet.
This makes it easy to manage your collection either manually or through the application's GUI, and I can even share the files with others quite easily from my web server. I also don't have to worry about a corrupted database destroying my entire collection. And I can copy a code file easily and drop it into a project's folder for use.
It is donationware, the author is
FSL, he is a DC member, and donating does have its perks. He gives you access to the privileged users area of his site where you can download versions of any of his applications with some extra features added. (his way of thanking you) You also get to beta test new stuff before he releases it to the rest of the world.
The big bonuses you get with DTT when you become a
privileged user is the ability to search, code folding for some of the languages it supports, some export options (like HTML, rtf), and an extra hotkey to restore the application from the tray.
This application has evolved quite a bit in the last year and keeps getting better & better. I have a feeling I may never find exactly what I am looking for (whatever that is) but if I wait a little longer FSL may surprise me and turn DTT into it and I can finally stop looking.