pgabell,
Based on your post, you would like to find a place to upload your VB Demo projects and the techniques. In my opinion, I would like to suggest you to open your personal Blog to write your own understanding and experience of the common techniques.
In order to manage your VB Demo better, I suggest you to classify your VB Demos by the different techniques. VB 101 Samples is quite a good package and you can download and study from the samples in the link below:
http://msdn2.microsoft.com/en-us/vbasic/ms789075.aspx
Hope that can provide you some idea.