As the others suggested, there are too many factors involved. The major factors are the size of your site and it's navigation. Sometimes a site will offer a calendar that provides 3 years of dates. If the navigation is not set up properly a crawler can get lost in the calendar. Every day on a calendar can offer daily view, weekly view, monthly view, birthdays, etc. Calendar issues are just one example of how a crawler can get "stuck" on a website.

Hi Derrick.

Both James and Ryan offer sound advice. I'll add just a bit.

Let's say you have an online store selling tennis supplies. Your store is a bunch of pages which can change a bit with the addition of a new product, but for the most part remain static. If you add a blog and offer a couple  quality articles per week, you have a chance to offer articles such as "Beginner's Guide To Tennis", "How to Choose a Tennis Racket", "How to Avoid Tennis Injuries" along with countless other topics.

You would be sharing your wisdom on a subject where you have expertise. When users seek this knowledge by typing in a search query such as "best tennis racket" they may find your "How to Choose a Tennis Racket" article where you mentioned "the best tennis racket for teenagers is the Wilson 1000". Your article would also contain a link to the Wilson 1000 where an interested reader could buy the item.

You would generate traffic for your site that you otherwise might not see. Also, users have an opportunity to ask you questions. Someone could ask "what is the best racket for a 30 yr old woman with a short reach?". You can then engage potential customers in a manner that your storefront site alone cannot do.

@azguy, can you offer a link to the page you are referring to?

@Bryce, would you mind sharing the sites on your checklist? The only directories I consider at all are DMOZ, Yahoo and BOTW. Are there others you feel are important?