Something that everyone should be aware of is a suite of updates that have been released to the Enterprise Vault Converters. These, as most people will know, convert content from the raw source, to HTML, for indexing purposes. There are converters for things like Microsoft Excel, PDF, and so on. You will see from the list in the following article that not every service pack has been hotfixed, so in order to get the updated version you may need to upgrade to a newer service pack/revision of Enterprise Vault first.
Here is a link to the article.