I was wondering if using HTML entities in meta tags (like keywords and description) is the best way to go?
Does it influence the indexing from search engines?
The meta tag "description" does have an effect on the ranking. It is the description that Google gives in the listing, so this is the most important part that influences people to click on your link. When more people click on your link, Google assumes it has more worth for users in the searches and moves you up.