Check your blog comments, sure there will be spam but I get many ideas from reading my comments. Check out other blogs in your community for inspiration. If your blog has been around for some time then check to see if there are any posts that you can update into a new post. Check youtube, find a great video and upload it. Do you have any other tips?
Produce good quality content... set up google alerts so you can come with ideas to write about.. whatever your blog is about..
Do guest blogging. Meaning: have one of your readers write a blog entry for you (of course you will screen and approve)
What I do is whenever I can think of something really wonderful to write, I immediately blog about it. When I don't have, I don't. The key is to have good content. Not just multiple entries.
It's a nice idea to check your blog comments, it gives you ideas as well as where you could potentially post links