There are a couple of use scenarios where I find useful to providing wireless access from your laptop:
- Creating a network “island” without a router;
- Sharing internet access to other laptops where only one wired point is available;
- Providing network and internet access to your PDA where no AP is available. My favorite usage :)
Here are a couple of tools:
Please note: at least for Virtual Router, there’s a (short) wireless network card short compatible list.