Website moving up and down SERPs alongside others in 'blocks'.

[teebus]

I have noticed that since the so-called 'Panda' updates my website has been moving up and down the Google SERPs in a kind of 'block' alongside other unrelated websites for certain keyword phrases. Whenever there is upwards or downwards movement it happens in tandem with the other websites in those blocks and it is very frustrating. Why is this and has anybody experienced anything similar?

The website - http://bit.ly/jIFHpm

The search engine - Google, US

The keyword phrase - First phrase of website meta title

Sorry for being so cryptic I just don't like openly giving out certain information - think it's a bad hangover from the Google Webmaster help forums where everything you post is indexed for Joe nobody to read at his leisure.

If anybody would like to mention anything else related to any on or off-page factors on the website then your time would be much appreciated. One thing I am a bit concerned about, for example, is the repition of 'monitors' on the 'monitor shop' dropdown on the top navigation menu and also the sidebar. This would put a localised high density of the keyword in these navigation areas and I am slightly concerned about that. I have no malicious intent and it is appropriate for the user but perhaps the manufacturer names alone would suffice?

Thanks in advance.

[DanDeceuster]

Google made over 500 changes to their algorithm last year. Each change affects different sites in different ways. I would be more concerned if your sites rankings were not fluctuating to be honest. There is nothing weird, unusual or wrong with bouncing around the serps. Just keeping doing tried and tested seo techniques and you will be fine.