Matt Handal’s Helping EveryBody Everyday is a useful resource, worthy of bookmarking.
Matt Handal makes some solid points in this posting on GTD Times (GTD = Getting Things Done).
The GTD system recommends that you have a series of lists you review on a regular basis. One list you should have is a relationship “hit list.” This is a list of your 10-15 most important business contacts. You should review this list monthly to make sure you “ping” each of these contacts (send them a note, call them, take them to lunch) at least once per month.
This is solid and rational advice, indeed.