Hmm that's quite longer from my past experience, but not unheard of. What troubles me is that your pages haven't disappeared completely from Google's index, e.g. if you enter "site:korokithakis.net" there are 302 results returned.
Perhaps Google has reevaluated your ranking for these keywords, as there are a lot of PR6-7 sites but yours is a PR4 (at least according to the SEO Site Tools extension).
Your best bet is to follow infinity's advice and start blogging more frequently, while targeting specific keywords for your posts.
Perhaps Google has reevaluated your ranking for these keywords, as there are a lot of PR6-7 sites but yours is a PR4 (at least according to the SEO Site Tools extension).
Your best bet is to follow infinity's advice and start blogging more frequently, while targeting specific keywords for your posts.