jopez.
if you look at the braces of your example 1, you see problem: The parenthesis are not parsed correctly. if you change the line to
{{adp /packages/xowiki/portlets/wwwgradient-public-blog {package_id 2370} }}
the matching of double curly parenthesis will work again. When the adp tag is used within curly braces, xowiki does not do further processing of the arguments, so your attempt #2 will now work, since this is not a valid syntax for adp includes. Omitting adp in your example 3 does not help either, since you have obviously only an adp include file. The includelet syntax without "adp "is allowed only for including other pages and for library based includelets, which are similar to widgets (see {{available-includelets}}).
The problem occurred due to double-parenthesis matching with regular expressions, which has its limits. i have changed for now the regular expression for the matching of the closing parenthesis into double-parenthesis followed by white space, so, actually the first example should work again in the updated version in cvs.
Finally, i would not recommend for casual xowiki users to use currently the version from cvs head. i am working on major extensions and restructurings, so it is not so unlikely that whatever version you get might have some issues. A more safe policy is to take versions that i announced in the forums (use for checkout the date of the release notes) or to wait for the next released version with release notes.
