I'm using #develop, a completely free open-source IDE that's a pretty good clone of Visual Studio .NET (except no debugger, yet), and it handles importing COM interop assemblies just fine. It will even import VS solutions and convert them to it's own "Combine" format. I've written some rather large applications with it and it's been great!
Although it looks as if they originally intended it to be for C# programming, I've been using it for VB.NET. It will even convert your source code between C# and VB.NET.
If you decide to try it, here are the COM import names for the two libraries that probably interest you. They are already part of the built-in import list, so you don't have to find the DLLs on your computer.
Microsoft HTML Object Libarary
Microsoft Internet Controls
The first one is huge and takes a couple of minutes to import. It will immediately add 10 mb to your application.