The following is a tutorial on posting to your blog on MSN Spaces using the W.Bloggar desktop blogging application.
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Create a Space on http://spaces.msn.com if you don't have one
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Go to 'Edit Your Space->Settings->Email Publishing'
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Turn on Email Publishing (screenshot below)
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Choose a secret word (screenshot below)
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Download and install the latest version of W.Bloggar from http://www.wbloggar.com
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Go to File->Add Account
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On the next screen, answer "Yes, I want to add it as a new account" when asked whether you already have a blog
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Select 'Custom' as your blog tool and choose an alias for this account (screenshot below)
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Select your Custom Blog Tool Settings as shown (screenshot below)
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Specify your provider information as follows; Host=storage.msn.com, Page=/storageservice/MetaWeblog.rpc, Port=443, HTTPS=checked (screenshot below)
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Enter your username and password. Your username is the name of your space (e.g. I use 'carnage4life' because the URL of my space is http://spaces.msn.com/members/carnage4life). The password is the secret word you selected when you turned on Email-Publishing on your space. (screenshot below)
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Click Finish.
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Go ahead and create, edit or delete blog posts on your blog using W.Bloggar