You may have heard about this already, but now it is official. SharePoint Designer is now free. You can download it directly from Microsoft by going to www.Microsoft.com/SPD.
In case you don't know, this is THE tool for hacking the SharePoint interface. It is not just for creative designers. You can configure the Data View web part in SharePoint Designer to do all sorts of groovey things that are not possible just through the web interface.
Of course, you can also shoot yourself in the foot with this one, so do be careful. Also, avoid the SharePoint Designer site (one of the nodes in a site collection) backup option if your site is larger than 25 MB.
Apart from those caveats, download and have fun! If you have previously licensed SharePoint Designer under a Software Assurance (SA) agreement, then you are now entitled to install Expression Web.
If you want to read more about this, see the open letter published on the Microsoft site
