Update: Solved. Refer to WordPress Update Links Solved.
One thing I finally noted with WordPress 1.5 is that there’s no more links-update-cache.xml file. Instead, under the wp-admin folder, we now have update-links.php.
If you crack that file open in your favorite text editor, you’ll see no trace of weblogs.com, which has a tendency to break occassionally. Instead, I see api.pingomatic.com.
If you were using the Update Linkroll plugin from Carthik (2fargon in the forums) back in 1.2.2, it won’t work anymore. You’ll either have to set a cron job or wait until someone creates a plugin. Well, you could also directly go to the file by bookmarking it and visiting it occassionally, but that’d be lame.
For the cron job, you’d need to run this periodically:
GET http://your-wordpress-site.com/wp-admin/update-links.php
If any of this is incorrect, I’ll edit this post later. For now, this was my excuse to give w.bloggar v4 another shot. Nope, no dice.
All Narfed Up 
Thanks for the tip. My link updates haven’t been working ever since I switched host. Maybe this will help.
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Where do you tell wordpress what RSS feeds to pick up and then check?
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Images, Ratings, RSS and Notes
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Perhaps my expectations of this feature are all wrong – I was expecting it to automatically import the links from the RSS Feeds and put those links into the blogroll area on the right hand side of my page.
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Hi, thanks for the usefull information. However, there’s a problem – api.pingomatic.com is broken…:-(
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