Oh I am very sorry freshginger. I edited my thread. Not December. It it October but neverthless I think it is late! I update my content everyday.
Create a blog section, A lot of the blog application will ping Google automatically with every new post.
How regularly your content has been updated really? Googlebots will always crawl upon the ratio your website update. For example - If you have them updated daily for a week or two then Googlebots would come and crawl (or cache) your page daily. It takes time and not just a few update recently could help anyway.
There are sites that even updated daily don't get indexed easily because of poor content they put on their site. Write something unique and useful then gather strong backlinks so your site will not only cached but could get rankings too.
submit your sitemap again in google webmaster tool or do one thing update your sitemap and submit your sitemap to various search engines
update your blog regularly. Google likes visiting sites with fresh content. Also increase the backlinks toyour site.