I wrote up a detailed article a few weeks ago describing how to create a SharePoint Designer workflow that sends a task reminder email on a daily basis. It’s been published at the new SharePoint Magazine site. More generally, the article shows how to create a looping structure in SPD.
The magazine has a wide variety of articles including, among other things, very technical stuff, interviews and industry news. I recommend you add it to your RSS feed.
If you have a product or service to sell, I’d also consider advertising on the site. It’s off to a strong start with several thousand pairs of eyes looking at it already. That’s sure to grow.
Lastly, if you’ve been itching to write something and get it out in front of a larger audience, this is a great time and place to scratch it.