Chip cross- reference guides

I’m having trouble finding chip equiavalents lately, IC Master doesn’t seem as efficient as it used to be, can anyone recommend a good on- line guide ?

I just did a search and found too many to list.

Go to www.google.com and do a search on combinations of the following words:

semiconductor
cross reference
IC
chip

http://www.chipdocs.com
http://www.embeddedlinks.com/chipdir/