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Enjoy, and let me know if you have any problems.
While I appreciate your help, I find the overlay method to produce slightly washed out logos, the way I did I was to start off like you said, wood with logo layer on top, I then added another wood layer, set to 50ish% opacity and set to 'darken' to bring out the grain, I then added another wood layer, and used the select colour range tool to select anything of a dark black, inverted the selection and deleted, lowrred the opacity a bit as to not cover the logo too heavily, and then to make another image all I had to do was make a new logo layer in the middle, and hide the last one, I thought it gave some good results without being as washed out,
A downside to my method is that the image is darker than the original wood, maybe there is a compromise in the middle of our methods, but when I did it it was late and I was just trying it out, dunno if I will bother with more though lol