Is WordPress best for me?

I need to set up a blog for a small charity who wants volunteers overseas to post updates on their work.

As some people will be quite computer illiterate and posting from remote locations, I need a blog software which is *very* simple to use, fast loading (for dial-up), allows multiple editors plus facility for subscribers to be notified when a post is made.

I’ve used WP before and very happy with it but I do feel that it could be very ‘heavy’ and cumbersome to use for their people. Is WP the best option or is there possibily a better alternative?

Thanks

Sal