Updating a Blog Post - What's the Best Way for SEO

[vandread]

I have a blog where I often post about updates, for instance when a new version of widget x is out, or when a widget has changed so much that it requires a new review. Up until now I have just added another post to my blog and did nothing else. This is probably not the best method SEO-wise, and I was wondering if you could recommend one.

I'm currently thinking about the following options:

> Update the original article instead of writing a new one. Pro: has already link juice, age. Con: Blog is not updated
> Link from the old to the new. Pro: Passes on link juice, visitors who visit the old article know that there is new information available. Con: Two articles that are very similar on site
> Redirect old article to new one with 301. Pro: Passes link juice, visitors get redirect to the new up to date review. Con: Overuse could be seen as trying to game the Serps, maybe?

Search engine wise, what would you say is the best option? Is there one that I have not mentioned?

[underglass]

Update the original article instead of writing a new one. Pro: has already link juice, age. Con: Blog is not updated

I think this is your best best.

It seems like if you have new information and you are updating the original article, then your Con is eliminated: The blog is updated. Can you change your blog date to reflect the update?

[balibones]

I agree with underglass.

You should also make sure the date on the page changes (If you have one. Personally I'd remove it) as well as the last updated date in your header and feed (if you use them).

Micheal Gray has written about this several times. What you should go search for is "living URLs" or "evergreen content".

Here's one of Graywolf's posts on it:
[wolf-howl.com...]