You can now override the default instructions that appear at the top of the grid ("These are all the proposed times for the event. Paint over all that are good for you."). Just click 'show options' to enter the whatever text you like. Handy for specifying locations, durations, etc.
In the future, the default message will be automatically translated into the local language for each of your respondents, so at that stage you may want to leave the field blank. In the meantime, you could use this option to replace the English-only instructions.
Select the 'hide dates' option to just show the day names.
Use this for planning 'generic' weeks, fortnights etc. Just choose any appropriate start and end dates for your desired range.
Following lots of useful feedback from ours users about this beta feature, we've tightened the iCal import code a lot. In particular, Google Calendar syncs should be working much more smoothly.
Thanks very much to everyone who has sent in their bugs / observations. Please keep them coming.