The Post Block module allows you to create blocks that display a list of links to the various content types on your site. The benefit of using Post Block is that you can specify exactly which content types are listed.
Post Block also gives you the ability to create as many blocks as you want; so you could create one block for each user role on your site, each with a customised list of content types those users can create. Note that any content types the current user doesn't have permission to create will be hidden for that user.
The output of Post Block is completely themable - simply override 'postblock.tpl.php' in your theme file. You can also override blocks on an individual basis, see the README.txt for more info on this.
That's it. That's all. Postblock!
Version 2 of Post Block is the one new users should download. It has all the features mentioned above and will be receiving new features and updates in the future.
Version 1 of Post Block is the one originally written by Jeff Eaton. It had a few bugs fixed and some code cleanup to bring it up to a stable release, and will only receive bug fixes in the future.