One Sitemap or several?

A quick question about the submission of sitemaps. I have several wordpress blogs associated to with my domain. One wordpress plugin allows you to submit a sitemap for that particular blog to google.

So i have a sitemap plugin installed and active on each blog, and I also have a sitemap on my main homepage that links to all of the blogs (this main sitemap I have added to my google webmasters account).

I would have thought that the main sitemap would show all of the blogs and all of the links to the content in each blog (a lot of content all in all!)

However it doesn't seem to be showing that at all....in fact, the only stats about my site and the sitemap for the whole thing is that I have 92 errors (which from what I can work out don't actually exist at all. The errors show that many pages on my site don't actually exist, where I know full well that they do!)

This is beginning to confuse me a little and was wondering if anyone had any ideas as to why I seem to be having problems.

Cant say I use wordpress TBH.

1. Cant you just use a simple html site map and link to the pages that way?

Or

2. Cant you create an xml sitemap for each blog?

Either of those 2 solutions will get all the pages indexed and thus circumvent the problem with the plugin.

Doesn't have to be pretty just list the links in 1 list not many people will check out your site map, if any at all.

Jaza