When was the last time you read a research guide or how-to book about genealogy or an area where you are researching? It is easy for even the most experienced researcher to occasionally overlook a record type or not be aware of a record that has recently become more accessible. Periodically review a chapter in a guide book-The Source: A Guidebook Of American Genealogy (Third Edition) and Val Greenwood'sThe Researcher's Guide to American Genealogy are two of my favorites. And for specific areas, the Family History Library's Research Guides are excellent. We all need a refresher every so often.
And I've been known to read a chapter from one of them when I was in need of an article idea and behind on a deadline.