Earlier today Adobe announced the soon-to-be-released Acrobat X family of products. Having seen a demonstration of some pre-release features, I can say that Acrobat X looks like it will accomplish several important things from the standpoint of legal practitioners. For example, the automation tools will increase the ease with which attorneys and support staff process documents. PDF Portfolios receive several enhancements, including the ability to control the order of documents in the PDF Portfolio (if you haven't used this feature, it is essentially using the PDF as a wrapper around a number of different document types - the documents are packaged much like an electronic binder, complete with a cover page and designer color schemes).
Acrobat.com will add an explicit tool to do what I've been manually using it for since Acrobat.com first went live. The SendNow tool will allow users to send large files that might not successfully move through e-mail systems. The SendNow tool will provide delivery receipts, a helpful addition for document delivery.
Personally, I am also interested in the prospect of SharePoint integration. Combined with improvements to SharePoint functions and improved SharePoint features available through Office 2010, SharePoint might make a very serviceable substitute for the pricey document management services that target the legal industry.
I will be sure to give Acrobat X a test drive when it is available and let you know how quickly you should look to update your stale version of Acrobat. Here's a hint that doesn't even require a test drive - if you are using Acrobat 7 or below, you must rush to upgrade; if you are using Acrobat 8, you should give some serious thought to upgrading at your earliest convenience. I'll let you know if you get enough out of the jump from Acrobat 9 to Acrobat X to justify the same recommendation that I give for versions 8 and below.