LaTeX, custom \newtheorem?

I wish to have something like this:

\vspace{5mm}\noindent{\bf Title of something}. {\it Content ...}\vspace{5mm}

But obviously that doesn't seem like a decent way to do it (especially as I'm likely to have hundreds of such statements). Is there a better way to do this?


I like the \newtheorem feature, but if I do something like this:

\newtheorem*{thm}{Theorem}
...
\begin{thm}[Title of something] Content ... \end{thm}

It will obviously shove 'Theorem' before everything else, and wrap the 'Title of something' in brackets, which is not what I want.


Thanks