For networking, there are 3 major players. Two are vendor
neutral, one is vendor specific.
Comptia Network+ and CWNA (Certified Wireless Network
Administrator) by Planet3 are vendor neutral. That means they are
not by any way related to any company or products.
CCNA (Cisco Certified Network Administrator) is a vendor specific
networking certification by Cisco and the some of the practicals
use their products.
There's not much difference between CCNA and Network+; concepts are
the same, but practicals will slightly differ.
For CWNA, it's best to have either CCNA or Network+, because
wireless networking is basically a build-up on wired networking and
most of the concepts for wireless are about the same as the wired
counterpart. You will also learn much more in CWNA, such as RF
technology, wireless technology, protecting your wireless networks,
the different data types in wireless transmission, collision (this
is especially important, because they are often confused with the
wired counterpart), site surveying, the different standards,
etc.
Security wise, no vendors will offer you a certification if you
have no experience. Security is a big field, and is further
sub-divided into various fields, such as network security, wireless
security, computer security, information security, etc. Each of
these fields overlap each other in a lot of ways, but they are
technically a field of their own.
As far as I know, there's a programming certification by Java. This
is a pure programming certification.
As for others such as Macromedia, Oracle, Microsoft are related to
web programming.
You can find more details here:
Comptia Network+
Cisco CCNA
Planet3 CWNA
Sun Java Certification
Certified Internet Web Master
Macromedia certifications (now acquired by
Adobe)
MCAD (Microsoft Certified Applications
Developer)
MCSD (Microsoft Certified Solutions
Developer)