Mike,
the problem with saying whether you are beginner/inter/expert is that no one will consider themselves an expert and if anyone does, why are they here and not making money at it!!! There is only one person who posts on a very rare occasion that I would put in that class.
While I don't consider myself a beginner anymore there are areas that I'm definitely not good at and wouldn't consider myself an expert in any shape or form. My techniques are very long winded and do not fully utilise the power of photoshop. I can totally understand someone new or relatively new to restoring who is eager to learn saying they are a beginner but it becomes more difficult to classify when you have been restoring more than, say, 6-12months.
I do have lots of photos that I bought for restoring off board that have less damage that I could post for the exercise but I think we may need to classify the object of repair or colouring for each photo. i.e, cracks, fading, colour restoring, lighting, removing/moving objects, use of layers/masking, use of filters, backgrounds, framing (one for Jim or Tomkin I think

) or even tool manipulation and what a tool is useful for.. some I never use if its outside my comfort zone!!!!!!!! Color management is another but I'm not sure anyone would want to try to explain that one

There is also the problem of the different types of software we use, PSP is different to CS2 or Elements and there are somethings in Elements you can't do that is possible in CS2 or PSP. I don't know the other free/cheaper software to be able to comment on them. I think if anyone does put up examples for critique they should mention which software package they are using so that any help will be in the right format for a beginner to understand. There is no point saying how to do things in CS2 that cannot be understood or done in the same manor in other software.
mmm... sorry no short way of putting all that, but there is more to this idea than just posting and a critique
Jenny