this is another interesting discussion "Relocalization Network beta launch, fork of organic groups"
http://drupal.org/node/22902
also some work towards "Show all content for a particular group (Organic Groups)?"
http://drupal.org/node/26559
this might be of some use "OG - Tweaking the UI for very large numbers of groups"
http://drupal.org/node/28224
For replacing default UI messages in Organic Groups, the String Overrides module works well. To get it to kick in, be sure to include the entire t() statement you are replacing including string parameters like %title.
If a user is not a member of any groups, the My Groups block can still show.
Tagging myself as 'insecure code' because I am not 100% sure of all possible outcomes, if someone more familiar with drupal internals finds
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