[If you're looking to add a physical keyboard to your Android tablet, check out our reviews of and keyboards that .]

Keyboard cases have always been popular accessories, but with the increased thickness of the new iPad, many cases designed for the iPad 2 are a little too tight for comfort, or don't fit at all. Fortunately, a large number of folio-style cases and cover-only keyboards fit the new iPad just fine. Some companies have also tweaked their existing keyboards to accommodate the slight increase in thickness.

When you're looking for a new keyboard case to match your freshly minted iPad, you'll want to consider the following:

Do you need all-around protection? Folio and clamshell cases cover the entire iPad, front and back, protecting it completely in your bag or on the table. Cover-style keyboards such as the Logitech Ultrathin Keyboard Cover and the Logitech Keyboard Case by ZAGG leave the back exposed, and cover the screen only during transport.

How often do you want to use the iPad without the keyboard? One of the main reasons for using a tablet with a separate keyboard is the flexibility and portability this arrangement affords as compared with using a standard small laptop. You have a keyboard for when you need it, but you can opt to separate the two and use the tablet alone when that's all you require. Some cases allow you to remove the iPad easily, while others, like the ClamCase, are more-permanent attachments.