Same problem here, fastthread 1.0.4 are 1.0.5 are broken or otherwise 
incompatible
with the latest update -
SOLUTION: uninstall fastthread 1.0.4 and explicitly install fastthread 
1.0.1

here is partial log of my session

Hoover-iMac:/var/www/cook amateur_peasant$ mongrel_rails start -d
dyld: NSLinkModule() error
dyld: Symbol not found: _rb_thread_alive_p
  Referenced from: 
/usr/local/lib/ruby/gems/1.8/gems/fastthread-1.0.4/lib/fastthread.bundle
  Expected in: flat namespace

Trace/BPT trap


Hoover-iMac:/usr/local amateur_peasant$ sudo  gem uninstall fastthread
Password:

You have requested to uninstall the gem:
        fastthread-1.0.4
mongrel-1.1.5 depends on [fastthread (>= 1.0.1)]
If you remove this gems, one or more dependencies will not be met.
Continue with Uninstall? [Yn]  y
Successfully uninstalled fastthread-1.0.4
Hoover-iMac:/usr/local amateur_peasant$ sudo gem install fastthread -v 
1.0.1

THEN I CAN START mongrel

Hoover-iMac:/var/www/cook amateur_peasant$ mongrel_rails start -d
Hoover-iMac:/var/www/cook amateur_peasant$



versions:

Mac OS X 10.4.11
ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.11.1]
gem 1.3.1
rake 0.8.4
mysql-5.1.32

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