I'm about to go thru a similar job-change. I've done a fair amount of perl coding in my current job, but the new one will be primarily writing perl application code. I'm expecting my new co-workers to point out lots of bad habits I've developed.
:)

ChilliHead - if I were you I'd try to find a way to put your efforts in re-learnig perl during your 'downtime' on your resume. It'll be a good sign to prospective employers that you're actually into programming, not just in it for the $$.