You can't stick to your free version, I'm afraid. There's a built in expiration date in the latest free version; after April 15th 2011 it will no longer work.
(As a side note, it would be interesting to use Reflector to decompile Reflector itself and remove the expiration date or extend it to the far future. I know it's illegal and unethical, but it would be a fun and interesting exercise.)
Most compiled code doesn't have debug info and internal symbols. Yet, changing something like an expiry date is often a trivial task. Obfuscation just means you'll actually have to poke around a bit instead of just searching for "isExpiryDateReached".
Reflector was written by a smart guy. IIRC the obfuscation partly consists of assemblies stored as resources in the executable assembly, and loaded dynamically. But no doubt you're right - it could be disentangled.
I agree $35 isn't a ripoff price, but not that 'everybody needs to be paid'.
For instance, Red Gate recently added an F# mode, which essentially doesn't work. If Reflector had been open source and free, I'd have been willing to get this feature running. The benefit I'd derive from a working F# mode would likely make the effort worthwhile.
I could be interested in building a Reflector clone if somebody would write an F# plug-in to the project. I would probably start with looking at the CCI-Metadata project on Codeplex, and the Microsoft Phoenix compiler framework. Mono has similar libraries, but I only know a very small subset of Mono.Cecil API.
I did look into cloning Reflector when Red Gate originally acquired it. The work involved looks similar to that needed to build a .NET compiler, but in reverse. That is, you take a low-level machine representation; then build up a control flow graph; then map that control flow graph onto common high-level constructs such as if statements and for loops.
Does the OSS community mean you or other people whose time you don't have to pay for? Open source works by volunteering and yet I don't see many people stepping up to work on an alternative.
That's because the need for an alternative has existed for less than 48 hours. I would prefer whoever has decided to do an alternative get a prototype built before announcing.
Announcing before you start can easily lead to vaporware. :)
An effort is already underway. Thankfully we have until the end of May to get this to a usable, somewhat mature state. RedGate's handling of this situation has lit a fire under me and a few other developers, and we're committed to releasing a free, open source competitor, and replacement, for Reflector.
There are some outstanding open source .NET libraries that blow away what you can get in Java. Likewise, some COTS .NET libraries blow away equivalent Java libraries (e.g., for unit testing and inversion of control, query-driven source code analysis, etc.).
But comparing .NET to anything other than Mono is apples to oranges.