I think that references to old threads are very helpful, and especially admire the patience and hard work of doc and MrLimo for finding so many of them for so many people. The flipside of NOT posting the earlier thread is that the new inquirer may otherwise not get the benefit of some of the wisdom, tips, tricks and good advice that some of us here have to offer. Quite frankly, I don't always time to post to all the threads I might have useful information on. When making these decisions as to whether to add some information or not, one of the things that goes through my mind is "didn't I already post this advice/tip/trick/recommendation on some earlier thread?" If I have already posted it somewhere, I am less inclined to spend my valuable time to repeat it (although I frequently do), since I know that someone with diligence could find the earlier thread if, for example, they want to find out all the prior references to the May Fair Intercontinental in London, one of my favorite hotels.
Glen's comments, however, raise another VERY GOOD REASON for people to please try to post in the appropriate forum. It makes it SO MUCH EASIER for people to find information that they are looking for in search if they go to the forum where the information should be, and it is actually there.
Djlawman