Put the summary of the bug you're having here
In my survival game, when I entered the nether the game crashed. When ever I try to reload the game it runs for a split second and crashes again. Other maps open/ run fine.
I am unsure how to replicate it but I will attach my save file. Also attached is the crash report.
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Also, you do not have the current java version.
I'm having the same issue. I'm currently running Minecraft 1.4.4-pre on 64-bit Debian Linux. I'm running 64-bit OpenJDK; the JRE version is 6.0_24-b24. I tried dropping back to Minecraft 1.4.2, but that didn't resolve the problem. The first two or three times I entered the Nether, there was no problem. After that, when I would enter the Nether, the game would crash. When I started it again, it would crash again after a few seconds. I found out that if I moved away from my Nether portal, it would stop crashing. Once that happens, I can usually move around in the Nether freely and return to the Overworld without crashing. But the next time I enter the Nether, the crashing starts up again. After the first time it happened, I deleted the Nether and let it regenerate. That seemed to fix the problem for a while, but after two or three more Nether trips, it started crashing again. Currently, the game crashes as soon as I enter the world, before I have a chance to move away from the portal. I'm attaching one of the crash reports. The filename is hs_err_pid10720.log. I can upload other files as necessary.

Since the theme with this issue seems to be an outdated java version, I would highly recommend upgrading to the current release version (either oracle or open-jdk), this being 7.0_9.
I updated OpenJDK to version 7, and that fixed the issue.

Ok, cool. Issue closed.
Hi!
Just a comment:
I had the same problem, but not when entering the nether. Instead, it occurred when I went near a certain place on the world map on a multiplayer game: MC 1.4.5 crashed and I was not able to enter the game again without crash. The problem only existed on my PC (64 Bit), but not on my laptop (32bit), which is too slow to play MC. However, I could use my laptop to move the player away from that place. After that, I could play MC on my PC as long as I didn't go to near to that place.
Apart from the hardware, both systems run openSuse Linux 12.1 32/64bit with the newest available java/openJDK 1.6 from the repositories.
When I read the bug report here, I installed java 1.7 from
http://software.opensuse.org/package/java-1_7_0-openjdk
although it's still said to be unstable there.
This package seems to have problems finding it's own libraries, in this case libjawt.so I found it in /usr/lib64/jvm/java-1.7.0-openjdk-1.7.0/jre/lib/amd64/
and so did
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib64/jvm/java-1.7.0-openjdk-1.7.0/jre/lib/amd64/
on the command line, just before starting MC there.
EDIT:
For some reason, java does not recognize the 64bit version of ~/.minecraft/bin/native/liblwjgl64.so.
To solve this, I moved liblwjgl.so to liblwjgl32.so and made a link to the 64bit one by
ln -s ./liblwjgl64.so liblwjgl.so
The other libs in this directory do not need this...
Now, it's running!
So, the summary is: It does not only happen when entering the nether, but also at certain places on the map. My 32Bit system is not affected and the update to openJDK 1.6 solved the problem on my 64Bit system.
I tried updating to the latest java when my Minecraft started crashing when I entered the nether in the 1.6 snapshots and it didn't fixed anything.

@Matt, are you getting a crash report similar to the ones attached to this issue ticket? If not I recommend creating a new bug report for your issue.
if you know the location of the fireball (sometimes you can see it for a while before it crashes) you can brew a speed potion 2, run up to it, and punch it or shoot it with an arrow.
Can you please attach the complete crash report ? The second half is missing.