Manning Publications have a great variety of books on .NET development. There’s the stuff you’d expect, such as books on C#, ASP.NET and SharePoint, but they’ve also produced books on IronPython and IronRuby (not many books on these languages), functional programming is both F# and C# and doing brownfield development and building DSLs using .NET. Many of their books have helped me get up to speed with .NET development, and I’m currently working my way through The Art of Unit Testing.
Another great thing about Manning Books is that they’re available in both paper and electronic form. This is great news for me, as I have disk space aplenty, but I’m running short on shelf space. There’s also the fact that while technology-specific books are useful, their shelf life is rather short. I’ll still buy paper editions of books that are longer on theory and technique, but when it comes to specific versions of languages, libraries or frameworks, I’ll take the ebook version.
One more great thing about Manning Books is that they’re generous with the discount codes. Their discount codes are often for 33% to 50% off the regular price, and they announce them on their Twitter account, @ManningBooks. If you’re looking to build your tech library and save money at the same time, you should follow them.
(Just so you know: Neither I nor anyone at the Developer and Platform Evangelism team at Microsoft have any kind of arrangement to promote Manning’s books. I just like their books, and getting a discounts on them is a bonus.)