Translator Plugin Pro provides search engine friendly nice permalinks / url for translated pages in blogs which use nice permalinks. For example if url of one of your blog post is http://stemcell.taragana.net/archive/dr-james-watson-is-himself-part-black-asian/ then the url of Portuguese version of your page will be http://stemcell.taragana.net/archive/dr-james-watson-is-himself-part-black-asian/pt/ and your Japanese version of your page will be http://stemcell.taragana.net/archive/dr-james-watson-is-himself-part-black-asian/ja/
Note: Translator Plugin Pro automatically adjusts itself to the blog permalink structure. In blogs using the nice permalinks, the translated pages are generated as described above. However in sites using the default permalinks structure, Translator Plugin Pro uses the same default query string format for translated pages. While it is recommended that you use nice permalink structure for SEO and other reasons, Translator Plugin Pro works both with and without nice permalink structure. The plugin will adopt to your preference.
Bookmarkable translated pages
The translated pages are bookmarkable in any browser or in third party tools and services like del.icio.us. They are indistinguishable from any other pages in your site if your site uses nice permalinks.
Translator Plugin Pro uses an intelligent caching engine to cache the translated pages. It uses advanced algorithms to determine when a page cache requires to be refreshed and marks it as such. It also uses background processing to refresh stale pages (based on priority) in cache. The caching engine helps Translator Plugin Pro to achieve dramatic performance improvements. The cached pages are compressed in database to minimize space requirements. The caching engine is extensively configurable. It can happily co-exist with other caching engines like wp-cache 2 or WordPress object cache. Read more »
Translator Plugin Pro has a load-balancing strategy to even out the load on translation engines by delaying successive requests to the same translation engine. The default time is set based on extensive testing of the translation engine limits as it is today.
You can also somewhat distribute the load by dividing the languages between multiple preferred engines.
Translator Plugin Gold incorporates several advanced load balancing capabilities. If you have a very popular site with load balancing considerations then you should definitely go for Translator Plugin Gold.