Scott Hanselman. If you are a Microsoft / .NET developer he is probably at the top of your list. Pragmatic, fun, quality blog posts and produces really good podcasts.
That being said, I usually read Eric Lippert's blog (www.ericlippert.com) although, since he "switched dev environments", I find the topics less relevant (for me).
Jimmy Bogard (marten, mediatr, general architecture)
Jeremyd Miller (structuremap)
Jeremy Skinner (fluentvalidation)
K Scott Allen (typescript and genereal .net core)
Mike Hadlow (.net core)
Mark Rendle (.net on linux, funny guy)
Jonathan Channon (nancyfx)
Brad Wilson (xunit)
Damien Edwards (.net core)
Rick Strahl (.net core)
Jon Galloway (javascript and .net)
Leon Bambrick (very funny guy, knows everything)