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I think Richard put it best.  I will add that we have a small flash video on our site, but that's it.  Everything from navigation, content, etc, is HTML based.  From the SEOmoz conference in March we heard that things are pretty much the same: Google still doesn't do a great job with flash.

I agree with John and Steven. We manage a number of sports blogs, and I have my content writers link back to old posts using new posts.  If there is a legitimate reason to link to the old post then go for it.  For a local music blog, I frequently write content that has no expiration date.  For example, I may post all summer about bands coming to town, or write reviews, but every few posts I might write a “top five music clubs in town” post. Those posts are relevant to my blog, they can be linked back to at a later date, and have the chance of picking up traffic at any time (depending on the search.)  Analytics will also tell you which posts are getting traffic, no matter how old the post may be.  That should give you a clue to what stays relevant.

After running one of my landing pages through the SEOmoz on-page keyword optimization tool, I see that my keywords are 13 characters from the front of the title.  My page is already receiving an A letter grade.  The 13 characters in front of my keyword phrase are not vital, but they related to the keyword phrase.  Is it that important that I drop the related word, in order to get my keyword phrase to start at the front?