Full-text searching with InnoDB tables is now available for your evaluation at Labs.MySQL.Com. Those used to the full-text search from MyIsam will find the basics are familiar. The MATCH() ... AGAINST syntax is there and has been augmented with some new features. How about better performance? You can use innodb_ft_sort_pll_degree to set the number of parallel threads used during tokenization and sorting (see this Transaction on InnoDB for details and timings). So if you wanted to move completely over to InnoDB but were holding back because of full-text searches, you need to check out MySQL 5.6!
InnoDB full-text search
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Cehck out http://blogs.innodb.com/wp/2011/07/difference-between-innodb-fts-and-myisam-fts/ on the design and http://blogs.innodb.com/wp/2011/07/innodb-fts-performance/ on the performance.