Resume writing workshops are great because they are a) short and b) often job or area specific. Often universities and other educational institutions have these. If you have been out of the workforce for a while or are just about to jump in for the first time, these workshops are great because they often tell the latest and greatest information that you should be adding into your resume for particular jobs.
These workshops are often linked with selection criteria and cover letter writing workshops. I think they are a great idea for working (or soon to be working)mothers to give them the edge and the confidence to (re)enter the workforce.