Category/tag entry search

[Andre Nathan]

Hello

I'm using this code to search for the latest post of a given category in
my blog:

 <% entry = weblog.find(:match => /^mycategory\//, :lastn => 1).first %>

Is there a better way to do that search? Maybe using tags? Ideally I'd
like to filter based on a tag name instead of relying on doing a match
that depends on the filesystem layout.

Thanks,
Andre