This is especially useful if you have drawn a blank on a keyword search or are not sure what keywords to use in a search. Find or ask for a current bibliography on the Internet. Also, many abstracts and even whole articles are now on the Internet. Use your favorite search engine such as altavista or Google . Attend a conference or workshop.
Conference proceedings are more up to date then journal articles.
Unfortunately, very few conference proceedings are in the library. If you know the reference, the article can be acquired by Interlibrary Loan.