MSA-USC Hadith Database
Warning (especially for Muslims)
There are many early hadith scholars and teachers to whom we are indebted for introducing the critical science of collecting and evaluating ahadeeth. These teachers each collected many different ahadeeth. They did not allow students to quote from their collections until the students had actually come to them and learnt from them directly.
Today, the situation is different. The collections of ahadeeth have for the most part stabilized, and with the advent of the printing press, the collections are easily mass-produced. There is a blessing in all this of course, but there is a real danger that Muslims will fall under the impression that owning a book or having a database is equivalent to being a scholar of ahadeeth. This is a great fallacy. Therefore, we would like to warn you that this database is merely a tool, and not a substitute for learning, much less scholarship in Islam.
From the Link.
"There are many early hadith scholars and teachers to whom we are indebted for introducing the critical science of collecting and evaluating ahadeeth."
A most interesting point - If it were true, as many here seem to believe, that simply because it is written in some hadith all muslims believe it and follow it, then the "evaluating" would not be necessary.