I'm starting to work with a third-party menu control by telerik. This is a company based out of Bulgaria with an office in the US. I've used their r.a.d. menu indirectly with a webgrid product that implements the telerik product for context menu purposes. I've been playing with the code samples and exploring their site. So far I'm very impressed. I especially like the control over the menu on the client-side. The look and feel of these menus is top-notch from what I've seen so far.
The menu samples they include with their install package are even better than what they have on their site and illustrates many ways to create the menus. I've always had to implement menus of my own in the past, and now I can take the time to check out a third party tool and integrate it. I'll be blogging about the experiences shortly - looking at the product as well as support and bits about their other products.