Hide posts on main page?

I'm not David, but I've set up something like this on my own site, so in case you haven't figured it out yourself yet: You can exclude a tag from showing up in the main feed. Tag any post you don't want to show with a dedicated tag, say "hidden". Then, in your entries.html, add {{^tagged.hidden}} after {{#entries}}, and {{/tagged.hidden}} before the closing {{/entries}}.

You can do the same thing with the {{#recentEntries}} tags in your feed.rss if you also don't want the post to appear in your main RSS feed.

The essential strategy will be to filter out entries from any of the entry lists in your template:

{{#entries}}
...
{{/entries}}

You could filter out these entries using either their tags or some custom metadata you set. Let's say you wanted to exclude all entries which have custom 'Orange' metadata declared:

{{#entries}}
{{^metadata.orange}}
...
{{/metadata.orange}}
{{/entries}}