In 4.0, even though it was not a supported customization, Organizations had the ability to perform some rather spiffy customizations to the CRM Banner. In fact, many organizations (especially those I work with in the Public Sector) see the banner as their own personal brand (similar to the way SharePoint sites are branded). In CRM 2011, since the banner area has been reduced, this decreases the ability to "Brand" a customized CRM system.
It may not seem like much, but this was a HUGE "Wow" factor in 4.0 (both in pre-sales and in the implementation itself), and this has been significantly redacted in CRM 2011.
1.) Perhaps add an option in the System Settings Area to display a custom Banner and allow us to upload one as a Web Resource. Thus if we choose to display a Custom Banner we can select it from a Web Resource lookup.
2.) If this is too involved, perhaps simply increase the height of the banner and allow the option to collaps it the same way you can collapse the Ribbon.