I tried the LogStore plugin, looks like it could be really handy. Unfortunately it doesn't seem to work out-of-the-box.
I had to change the compact() call in the log() function to:
$values = apply_filters('logstore_new_entry-'.$this->_name, compact('time', 'message', 'data', 'tag', 'status'));
Basically I changed all $var to 'var'.
Hope this helps,
Thanks for your work!