If you go to http://www.bloglet.com/ and sign up and when prompted for type, etc... of you blog specify:
weblog type: RSS
of course substituting userid with your LJ userid
(this works only for Paid accounts BTW)... you will get an email list where you can allow it to post the entire contents of your posts to email.... (you can also restrict it to the first few words, the title, etc).
If you don't have a paid account you should be able to use http://www.livejournal.com/users/userid/rss but you will only get the titles.
What bloglet does is once a day goes out and culls the new posts and puts them all in a single email (One email a day.... yah). and sends them out. It also gives you a small web form you can include in your style to allow subscriptions.