Just upgraded from a static site to Joomla? Or just reorganised your content? And, of course, you don't want to loose your existing Google PageRank and your external links...
What you can do?
301 redirect is the most efficient and Search Engine Friendly method for webpage redirection. It's not that hard to implement and it should preserve your search engine rankings for that particular page. If you have to change file names or move pages around, it's the safest option. The code "301" is interpreted as "moved permanently". This is the solution Google recommends for webmasters to keep their ratings.