productivity
Best SharePoint blogs RSS feeds aggregation
**UPDATE!
Work with SharePoint Content Types and Site Columns using intellisense - Imtech Fields Explorer v1.4.0.0
An important update to this version has been published. See Imtech Fields Explorer v1.4.1.0 for more details.
SharePoint developer bookmarklets updated
Recently I've been working quite intensively with the SharePoint developer bookmarklets. SharePoint is really infamous of way too many clicks required to accomplish various things. Having shortcuts to the most commonly used functionality within one click saves really a lot of time.
Getting quickly to the VirtualDirectories folder in Explorer View
I'm a big fan of using the Explorer View: it provides you much more overview of the file system and allows you to access other directories with a single click even if they are located in a different branch on the file system.
Browsing .wsp files using Windows Explorer
How many times did you actually have to rename the .wsp file to .cab in order to browse its contents? SharePoint 2007 allows you to use any extension for the solution files, so you could build all your solutions with the .cab extension to support quick browsing. This has however two downsides.