You hear people say that blog consistency is key, but how much is enough?

My guidelines:

A new blog must be posted daily (weekdays).  This must go on until it has acheived resonance in Google (ie indexing and page rank).

A blog that has little notice in the blogosphere must be posted at least every other day (weekdays).

A successful blog may be posted every M,W,F, but the more frequent the posts, the better your results.  I say if you can post several times daily, then all the better.  Prolific writers improve their writing quickly and they bring the search engines to their site often.  If their content is good they’ll also bring subscribers and visitors quite often.