Sure!!
Well obviously you have to read The Three Musketeers, that's kind of a given. I haven't read all the sequel stuff, just the first one (Twenty Years After? Ten Years Later? I forget) which had some good stuff... more historical fiction than swashbucklery action, though.
Sabatini's romantic elements can be a bit cloying at times. (Rather contrived "oh, s/he couldn't love me", misunderstandings, stuff like that.) That being said, he wrote some really good books, particularly
Captain Blood, the Captain Blood short stories, and
Scaramouche (but not its sequel).
Another good but rather forgotten swashbuckler writer was a Brit named Stanley Weyman.
Adventures of a Gentleman of France is really great; one of my favourites period.
Under the Red Robe doesn't have as much action (more romance... the main character is interesting, as a scoundrel working as an agent of Cardinel Richelieu, warring with his neglected better side) but is a good read too.
Weyman is impossible to find in physical form these days, though. A bunch of his books are available as text files at Project Gutenberg, and I have converted a couple of these, as well as some books by Sabatini to PDF. I could email them to you or you can grab them from the files section of the "swashbuckling" list at yahoogroups.com, if you have or create an ID there.
Some links...
The Sabatini website is at
http://www.rafaelsabatini.com/
There's a good overview of Weyman at
http://www.violetbooks.com/weyman.html
Also there are lists at Yahoo Groups devoted to Dumas, to Sabatini, and to Weyman. There's also the swashbuckling list I mentioned which is a general one devoted to books and films.