There are sveral pointers I can give you right now:
1. Meta tags are not very important for google right now. They were, but because of SE spamming they were mostly dumped by Google.
2. There are other SEs that consider meta tags (keyword and description being the ones which matter the most)
You should reduce the size of both.
You need to pick two or three keyword phrases to optimize your page for.
You need to have those keywords actually present in page content (2 or three times, close to the top of the page)
you could make subdirs with names of keywords you choose to optimize for
pich not-so-high traffic keyword phrases (up to 10000 Google hits a month) because its easier to gain good SE ranking for them
Check out my page at
http://www.johnnysporn.com/ and look how I optimized it for phrase "paysite previews".
Here is my google position for that phrase:
http://www.google.com/search?hl=en&q...=Google+Search
Hope it helps!