Checking to see if a record exists and if so update else insert

I've decided to post this as a sticky given the frequency this question is asked.

For those of you wishing to build a package that determines if a source row exists in the destination and if so update it else insert it, this link is for you.

http://blogs.conchango.com/jamiethomson/archive/2006/09/12/SSIS_3A00_-Checking-if-a-row-exists-and-if-it-does_2C00_-has-it-changed.aspx

Thanks Jamie!

If you want to do a similar concept to Jamie's blog post above, but with the Konesan's Checksum Transformation to quickly compare MANY fields, you can visit here:
http://www.ssistalk.com/2007/03/09/ssis-using-a-checksum-to-determine-if-a-row-has-changed/

Phil