We all know that Google Just loves Blogs. Fresh content, Links, Anchor text title headers and what not. There are good SEO tips at many Blogs.. And you will find lots of resources at Darren's Problogger and some other. I have a couple of Tips too. I haven't read about these tips elsewhere so these are new, perhaps. I don't know, but they sure are helpful. 1) Links to each posts: Give a link to most of the posts on the front page so that google bot finds a link to each post which in effect is a page, with Unique Header titles. You must have read from other sources, the relevenace of Keywords in Post Titles from other sources. Make sure to keyword the anchor texts 2) Using Archives: I wanted google to find a link to all my post so I first set the Archives at weekly. This is better achieved if I put a direct link to the post with anchor text ... Why did I say, Using Archives, then in the header? The best way to set archives is by month. How? Your monthly archives becomes a page that Google Indexes.. Considering that you write a 30 posts a month, 30 pages have been made into a Hugely content filled Page, and Google has a way of mixing up keywords to match a Searched Phrase. 3) Set number of post on the Blog Homepage to the maximum. By the same logic above, you have Huge Home page Filled with Content. Very search engine Friendly, but a little slow to load if your Page is Image heavy. Since I have a fan following on one of my blogs, I have decided to make the home page Fan Friendly at the cost of google traffic, but if you Love Google Traffic, Loaded Front page is good for SEO. 4) Blog on similar topic for each Month: If your blog is not a Niche Blog and you cover a variety of topics, at least Blog on similar topics each month. That way your Monthly archived page will be targetted to a particular Topic. 5)Lots of categories: If you are using Wordpress or MT, create as many categories as possible. More categories, more unique pages to index . Other Tips that you must have come across are, a) Making the Post Title an Anchor Text. In blogspot it is not by default so you have add an HREF to the Post Title <$BlogItemTitle$> with <$BlogItemPermalinkURL$> b) Keyword optimising the Title of the post. But beware, too much optimisation drives away regular traffic. Etc etc..
The problem with monthly archives is that somebody reading your blog very rarely wants to see what you posted last March. They may however want to read all the posts you have made about a certain topic so you need to make sure posts are archived by topic rather than month IMO.
Err... Archiving is done by Period IMO.. You can use categories for the Topic wise content management.. I will add that point too.. I was just too Blogspot Specific.. U see I am blogspotter