The module I have been working on lately is one that can decode binary encoded XML (wbxml) back into a format that the XML parsers on CPAN can work with.
The current version I have works fine on ASCII systems, but the spec supports various other character sets. A quick search on CPAN led me to look at the I18N::Charset module. This basically does what I need internally, but doesn't expose an external method. So after a quick bit of hacking I've emailed off a patch to the author, Martin Thurn. Hopefully he'll add it in, else I'll have to look at another way of getting the information I need when I release it.