Technorati now allows users to subscribe to a keyword search through a watchlist delivered in RSS format. You could of course do the same thing through the Technorati API through a SearchQuery and setting your format parameter to rss, but this method is a lot easier and finally fills a big hole for Technorati persistent search.
Technorati also supports the use of boolean operators such as "AND" and "OR" and "NOT." Note the operators must be in all capital letters for Technorati's query analyzer to parse correctly.
