Please find links below for more information.
Assuming you are looking for certifications in WebSphere Application Server 5.0 and/or WebSphere Studio Application Developer (WSAD) 5.0:
Some developer oriented certifications that are available are
1. 285 - WSAD 5.0 Associate Developer
2. 286 - WSAD 5.0 Solution Developer (requires Java Programmer certification also)
3. IBM Certified Enterprise developer - 287 (J2EE development with WSAD), 484 - Enterprise connectivity 486 - UML. (requires Java programmer certification also)
1. 341 - Basic WebSphere administration
2. 342 - WebSphere multiplatform administration.
There are many more.
Also IBM is currently offering free vouchers (which you can use as payment for taking certification tests) for all above and many more certifications, for those who pass sample tests. Please find more information on that below. They have 2000 free vouchers to give, but they might be running out of them. It started on Dec 1st. Just now checked on the IBM site this program is not closed yet.