If you want to enhance the user experience and feeling of a group of Reporting Services reports and don't have SharePoint? You don't have to use the standard report library. Below is a screenshot where I use a tabular navigation looking a lot like a web site using just SSRS 2008 R2 standalone. The tabs are just actions that points to another report using the same header subreport. The user can navigate within the reports without having to go the the report library.
You could also brand use the web service interface to find reports and create your own branded SSRS portal using a SSRS report.