Are there any free components out there that will give highlighting and/or intellisense for HLSL?
I've seen mentions of something called "InteliSense.Net," but the author's site is down and I can't find a download anywhere.
Not a direct answer to your question, but this is what I do to solve the same problem:
I set Visual Studio to open *.fx
files in Notepad++. (Right click the file, Open With, Add Notepad++, Set Default). Of course, you can use any editor you like.
I use a HLSL syntax highlighting file for Notepad++ that I found on Google. I think it's this one.
And finally, I keep this MSDN page open in my browser: Intrinsic Functions (DirectX HLSL). Because HLSL is so simple - with no way to mess around defining classes and such - and the programs are usually quite small and self-contained, I find that this is sufficient.