After browsing the online docs it seems that I can have multiple galleries per page or post, but not multiple, discrete slide shows e.g there are no options to assign slides to a particular show. the obvious workaround is simply to have multiple subordinate pages (as in Current Projects in the above blog) but I’m just looking for confirmation that I haven’t missed something.
The WP slideshow displays all the images uploaded to the post. For multiple slideshows displaying different images each, you need 3rd-party slideshows. See here: http://en.support.wordpress.com/slideshows/ and click the Related Links
* RockYou Slideshows
* Slide Slideshows
* SlideShare Slideshows