If you're running a home business
If you're running a home business (eBay or otherwise) you need to constantly pay attention to marketing, network with people who can help you succeed, and stay inspired week in and week out. Des Walsh has a blog called Thinking Home Business that helps with all of these home biz aspects.
Surf around that site for a bit, and I'm certain you'll find a handful of insightful business tips that you can apply directly to your eBay business. Walsh brings a lot of other good resources together at the site, and he acts as an excellent information filter.
There's a lot of garbage out there that gets cycled and re-cycled through blogs. This one helps you weed through it all and increases the chances that you'll stumble onto something really useful. If you're looking for accurate, reliable, actionable small business information, watch this blog every week.