Manual Testing is Unsustainable
Best bits from the article by James Grenning
Every iteration, not only does the new functionality have to be tested, but the prior iterations’ working features have to be retested too. No problem, just add some more resources; I mean plug compatible testing units; I mean people with the needed skills and knowledge.

Full article from James Grenning
Manual Test is Unsustainable
http://www.renaissancesoftware.net/blog/archives/206