Podio - currently being wowed by this web application. It's a highly customisable collaborative "space" for your team to manage there activities. Essentially you create a "space" then populate it with the apps (widgets) that have the greatest affinity with what your "space" is about. So if you were collaborating on a new website then you will use apps from the software development pack (suite of apps) but you can mix and match apps from any category to provide a completely customised environment to manage your work & team with. This concept is excellent as I've used many "management" type sites, must notably (and well known) being Basecamp and found it good but not great - its suitability & popularity varied between project/client - with Podio you can tune the environment to ensure that you only have the features you need and even better you can create your own apps if there is nothing suitable available; I've not tried this feature yet but think it's the ultimate feature! Great user support from the guys there too - very responsive and from the fairly small amount of time I've spent with it so far (I'm running a new project from it) it's been a robust and good quality application but performance can be a little slow, something I think the team there are working on though.
Summary: Highly recommend this if you aren't 100% happy with your current project management tools, well worth a testdrive! (free plan/signup)
Source Meet (via - Greg's Cool [Insert Clever Name] of the Day) - this looks great! I'm interested in this as I've started to get contributors on my OSS project MonitorWang and this tool looks just the job for some remote pair programming and idea shaping.
"Source Meet enables software developers to directly and quickly view and edit source code together, wherever they are and in the development environment they are familiar with. Not only all of the modifications to the document, but also conditions such as highlighting or position changes are synchronized in real-time with all participants. The additional combination with Instant Messaging, virtual team grouping and context-sensitive collaboration significantly enhances the efficiency in cooperation for development teams".
NuGet - the .Net package management system. This is something I've been following but not actively used, however a contributor to MonitorWang, Rob Gibbens packaged the assemblies required to create your own custom MonitorWang plugins and I have to say it's impressive stuff, a really slick way to get people connected to your code/components. Thanks Rob for introducing this!
The packages below give you the required MonitorWang assemblies to allow you to develop custom MonitorWang plugins...just choose your flavour!