Can I suggest that this works!!!! A few times recently I have found the answers to unanswered questions - I can remember roughly how the question was phrased and have used this facility, but failed to find the question !!
Scotsman - it isn't an easy or particularly good way to do it - but at the top of every category it has 4 tabs:
Most Recent
Most Recently Answered
All Unanswered
All Answered
So if you know the question was in Home & Garden or something you could go to that category and click on the All Unanswered at the top of it and maybe find it that way.