In zabbix_servr.log we can see such records:
17082:20130924:115200.589 putting host [it0] into maintenance (with data collection)
17082:20130924:115700.750 taking host [it0] out of maintenance

Would be nice and I believe is some cases very useful to see a maintenance name which puts a host to maintenance.
For example it could be:
17082:20130924:115200.589 putting host [it0] into maintenance [its name] (with data collection)

I'm not sure it's possible to do the same for log records "taking host [it0] out of maintenance", but if possible it would be perfect.