A lot of people don't know this but by having your blogger blog archieve indexable, your blog will get penalized by Search Engines and as a result your blog search engine rankings could decrease or your blog could be removed from search engine search results. I've recently implemented the noindex meta tag on my blog archieve page to eliminate problems with search engines.

Why Can't My Blog Archieve Be Indexable?
People use to use blog archieves as a Black Hat SEO trick to manipulate their search engine rankings. At first, this trick worked, untill search engines caught onto this trick. Now, search engines are looking out for this kind of manipulation and will penalize anyone using this Black Hat SEO trick. When this trick is used, it triggers the duplicant content alert to search engines. I'm sure you've heard that search engines hate duplicant content with all their heart. Duplicant content is one of the easiest and best ways to decrease your website search engine rankings.
With that being said, here is how to make your blogger blog archieve noindex:
All you have to do is go to your blog dashboard, then templates and once you click on templates, look for edit html and click it. Your final steps are to insert this code: http://www.sendspace.com/file/gkerkl
without qoutes in between the head of your html.
By adding  this code to your blog, search engines will de-index your.blog archieve from their search results. You have to keep the code on your blog in order for your blog archieve to stay de-indexed. It may take a long time for search engines to remove your blog archieve but if your in a rush, you can ping your blog.
Pinging your blog will let search engines know you have a new update on your blog and will force search engine spiders to find find that update right away. A good website for pinging would be BulkPing.com All you have to do is go to BulkPing.com and they will ask for the URL you would like to ping. Give them the URL to your blog archieve and then click ping. Your blog archieve should be de-indexed in 24 hours after pinging your archieve.
Summary

Indexable blog archieves lead to duplicanr content issues. You wan't to make sure search engines can't index them, so your blog doesn'g get penalized. Hopefully you will implement the noindex code on your blog archieve to prevent your blog from getting penalized. Thanks for reading!