After some testing it seems that Gallery search excludes album description (and also category descriptions)... which seems strange.
At least for me the normal use case looks something like this;
1 - Create an album (e.g. with a album description: John Smiths wedding)
2 - Populate all images/photos taken with digital camera (many files named IMG_5776.JPG, IMG_5777.JPG... and so forth)
3 - Ready!
Later on people would like to see those images/photos and they know that John Smith had his wedding, but they can't intuitively find that album -> they use search function and looks for 'John Smith' or 'wedding'... but nothing shows up?
Am I missing something?
Ahh, and it would also seem like a very needful thing to be able to search within album names...
E.g. an album named 'John Smith's birthday party!' ought to show up when a search is being done for Smith?