If you've seen the interface on blogslammer, then it makes it easier to explain. BS does all the work for you when it comes to finding, logging in and creating the urls and blog titles.
BS has a built in search engine with common WP search terms or you can add your own. Once a list of blogs is returned, there are boxes to input your user id, email address, blog title, and blog url.
And it offers the option to randomly insert user id, blog title and blog url from a list of choices you put in.
For example: Blog title box - {happy clowns|sad clowns|green clowns} BS will randomly pick one of those Blog titles and insert it as the title in the free WP blog. So the more options you put in, the more blog titles and blog urls you get for the same niche.
Build a throw away email account (you'll need new a new one each time you run BS because the same sites are gonna be returned after your next search) The email account must be forwarded to an account with POP 110 access (Gmail uses another port and Yahoo Mail only offers POP 110 on paid accounts). I have a hosted domain and it offers POP 110 access, so all my email is forwarded to it.
As BS creates accounts, blog activation emails will go to the throwaway email account and be forwarded to my POP 110 account. BS will pull in all the activation emails, activate the accounts, delete the emails and collect all the blog user id's and pw's.
Learning to post is almost as easy, there are several good video tutorials on the BS site. The pain is learning to spin articles to create readable unique content. BS will pull random sentences from a seed article that you supply, but don't expect it to be readable. Posting RSS content is as simple as copying and pasting the RSS link into BS, there is a template designed to post RSS feeds and any other article content you want. It's a matter of getting use to the BS options and playing around with them. I created one test site just to see how things come out when I play around.
Hopefully that makes things a little clearer.
Now the bad part. WP 2.6 does not allow by default, remote posting. As more WPMU owners upgrade to 2.6, remote posting will disabled. That is where being part of a WPMU blogfarm comes in. BS is offering membership in a WPMU blogfarm, but to qualify you have to have a domain offering free WP blogs as well.
It's getting a little too complicated for my noob head, so I am sticking with the free sites I've already created for now. Too much to read on BHW and too much to understand at one time. So I have to set my priorities. Right now it is learning SEO, reading as much as I can on different blogging traffic techniques, and setting up free blogs on WP, blogspot, Squidoo and Hubpages and concentrating on backlinks. Maybe in a year I'll feel confident enough about hiding my tracks to try some real BH stuff, but you gotta crawl before you run.