Last night, I was trying to find something pretty specific, a PostScript program that generates random mazes when you send it down to your printer. I was having a hard time finding it with quick searches for "postscript maze" and the like, so I switched to advanced search.
What I decided to do was a search limited by filetype to Postscript (.ps) files with the word "maze" in the filename (or URL).
I was surprised to find that only Google supports this query (e.g. [allinurl: maze filetype:ps]). I think AltaVista used to be able to do it, but can't now that it is owned by Yahoo. Yahoo, MSN Search, Ask, none of the other engines can do this particular query.
There is a debate right now about whether search can be improved by giving people more powerful tools (advanced search, MSN Search's "Search Builder", Clusty's clustering, A9's "columns") or whether search just needs to do the right thing (question answering, personalized search).
While I'm not a huge believer in improving search with more powerful tools -- I don't think the mainstream will bother with them -- I'm surprised that advanced search isn't getting more attention. I was amazed that only Google supported this particular search.
By the way, PostScript is a full programming language, though a rather bizarre one, so it really is possible to write very short programs that generates mazes, fractals, and other goodies when you send them down to your printer.
I did a few of these back when I was in undergrad, but I've misplaced the files now, so I went searching so see what other people did. If you want to check out what I found, here's two ( ) of my favorites. They're PostScript files, so you'll need a PostScript printer or GSView to see them.