Here’s a quick tip I use quite often. Sometimes I don’t actually want to create and use up a tab in my org for custom objects, especially when the object is usually accessed through related lists on another object. Sometimes I want to see all the records without going through a parent. In those cases, you can access the tab page using a URL trick:
1. Figure out what the key prefix is for the object. This is the first three characters of the object ID. You can use http://workbench.developerforce.com to find this prefix. Go to Info -> Standard and Custom Objects and select the object you want. Expand the Attributes and look for keyPrefix.
2. Once you’ve got the prefix, point your browser to https://yourinstance.salesforce.com/prefix/o. So to get to Accounts, you’d go to: https://na12.salesforce.com/001/o.