What sort of work should I include in a portfolio?

A manager of a design group mentioned to me that my portfolio should be around 5-6 pieces total that I show for a job interview.

Those pieces should be half interactive (web stuff) and half static (jpegs, etc).

I am wokring on my 1st Flash site that I hope to have done soon (would cover one of the interactive pieces).

What other sort of pieces should I show (logos, icons, magazine layouts, etc)?

I just want to see what would be the best style of pieces I should focus on creating to attract the most attention during an interview.