Calculate next date in series of dates

[led_blunt]

I have a spreadsheet that lists items in column A with a start date in column B. What I need to do is in in column C list the next review date in increments of 5 days, but I only want the next day to show from the current date, not the inputted start date.

For example:

Column A Column B Column C
Item Start Date Next Review Date
Item A 12-Sept-09 27-Sep-09

Can I get a formula to calculate the increments and only show the next calendar date for the review, and then to change to the next date once the previous date has passed.

Alternatively, I have another sheet in my workbook that calculates the dates, is there some way I can display the next future date in a line of dates?

How I explained this properly, thanks

Matt