Should the data in @LogData be encoded first?
Should the greater-than signs in the log content be changed to HTML equivalents?

Yes. You can do so by using HTML::Entities.

Note: You should also do that for <textarea>'s, because if you don't, </textarea> will end the thing :)

2;0 juerd@ouranos:~$ perl -e'undef christmas'
Segmentation fault
2;139 juerd@ouranos:~$
[download]