Christy--
I think that it is worded correctly. For regular Ledgies, there are banner ads displayed on the Ledge entrance page at the top as well as at the top of each forum and in each thread. Supporting Ledgies do not see the banner ads.
Pip--
Please see this section for information about the Supporting Ledgies:
http://ledge.fleetwoodmac.net/subscriptions.php
Thanks!
- Marty