For those migrating to Windows 7, you may find your favorite
programs won't work or need a paid update. Here're some suggestions.
On older OSs, I relied on ZoneAlarm firewall for protection. For Windows 7, I use the free Microsoft Security Essentials.
While it's not a firewall, it gets good reviews and isn't annoying like ZoneAlarm.
While discussing protection, I recommend the World Of Trust (WOT) Firefox extension that puts a red dot next to unsafe links and green dots next to safe links, based on the experiences of users worldwide.
On older OSs, I used Partition Magic for disk partitioning and maintenance. Partition Magic is no more so now I use a free program called Partition Wizard.
To manage my multi-boot configuration, I use a free program called Easy BCD.
You might expect the search function included with Windows would be reasonably reliable, but sadly, it broke when Microsoft moved to Vista and it was not fixed for Windows 7. Simple searches fail, even when matching files are on the search path and in view. Content searches fail, even for content in text files.
Instead, I've resorted to using a free program called Agent Ransack.
Here's one last free tool I couldn’t live without, FileMenu Tools:
It adds a bunch of tools to the Windows Explorer context menu, in particular Copy Path and Command Line from Here. In my picture, all the tools are in one sub-menu, but you can arrange them any way you like including putting them on the main context menu, saving one click to open the sub-menu.
Hope that helps! If you've found better tools, please let me know.