bold numbering in \enumerate environment?

[Matthias Diehl]

Hello,
does anybody know how to change the numbers of an \enumerate environment
temporarily into bold numbers?

I want to have bold headings with a number. But the following passages of
various textformats (!) shall be indented. So I wanted to use the  
\enumerate environment
for the indentation. But then it is very hard, to get the numbers bold.

Thanks!

Regards
Matthias Diehl