Well, you've obviously worked very hard on
SEO. I don't see any low hanging fruit that you haven't picked.
For keyword density and prominance, my favorite tool is :
http://www.searchguild.com/redir/o.p...ls/spider.html
A quick check there reveals 38 uses of the term "rent a car"... which may be a few too many and may look spammy to search engines. I'd also question why you decided to repeat words in your title tag. (I'd probably change "Rent a car services in Bucharest Romania Terra Rent Car rental services in Bucharest" to something like"Terra Rent-a-Car: rental cars and services in Bucharest Romania")
This tag: "<meta NAME='revisit-after' CONTENT='7 days'>" is unnecessary and won't improve performance. I'd blow it away.
Nice looking site! The flashing headlights are a nice touch.