Mike, Chad and Bruce have all opened up their inner repositories and showed us what lies within; I thought I'd show mine too. Here's what's installed on my box:

action_profiler (1.0.0)
actionmailer (1.3.2, 1.3.1, 1.3.0, 1.2.5.5848, 1.2.5, 1.2.3, 1.2.1, 1.2.0)
actionpack (1.13.2, 1.13.1, 1.13.0, 1.12.5.5848, 1.12.5, 1.12.3, 1.12.1, 1.12.0)
actionwebservice (1.2.2, 1.2.1, 1.2.0, 1.1.6.5848, 1.1.6, 1.1.4, 1.1.2, 1.1.0)
activerecord (1.15.2, 1.15.1, 1.15.0, 1.14.4.5848, 1.14.4, 1.14.3, 1.14.2, 1.14.0)
activesupport (1.4.1, 1.4.0, 1.3.1.5848, 1.3.1, 1.3.0)
acts_as_ferret (0.3.1)
aws-s3 (0.3.0, 0.0.8952)
builder (2.0.0)
capistrano (1.3.1, 1.2.0, 1.1.0)
cgi_multipart_eof_fix (2.0.2)
color-tools (1.3.0)
creditcard (1.0)
daemons (1.0.4, 0.4.4)
director (0.1)
facets (1.8.8, 1.7.46)
fastercsv (1.2.0)
fastthread (0.6.3, 0.6.2)
fcgi (0.8.7, 0.8.6.1)
ferret (0.10.14)
flexmock (0.5.0, 0.4.5, 0.4.3, 0.3.0)
gem_plugin (0.2.2, 0.2.1)
google-geocode (1.2.1, 1.2.0)
gruff (0.2.8, 0.1.1)
hoe (1.1.7)
icalendar (0.98, 0.97, 0.96.4)
json (0.4.3)
Linguistics (1.0.3)
mailfactory (1.2.3)
markaby (0.5)
mime-types (1.15)
mocha (0.4.0)
model_security_generator (0.0.9)
mongrel (1.0.1, 1.0, 0.3.13.4, 0.3.13.1)
mongrel_cluster (0.2.1)
mysql (2.7)
needle (1.3.0)
net-sftp (1.1.0)
net-ssh (1.0.10, 1.0.8)
payment (1.0.1)
pdf-writer (1.1.3)
rails (1.2.2, 1.2.1, 1.2.0, 1.1.6.5848, 1.1.6, 1.1.4, 1.1.2, 1.1.0)
rake (0.7.1)
rc-rest (2.2.1, 2.1.0, 1.0.0)
rcov (0.7.0.1)
RedCloth (3.0.4, 3.0.3)
redgreen (1.2)
rspec (0.7.5.1)
ruby-growl (1.0.1)
ruby-prof (0.4.1)
rubycas-client (0.11.0, 0.10.1)
rubyforge (0.4.0)
rubygems-update (0.9.2)
rubyzip (0.9.1)
ruport (0.8.10)
s33r (0.5.2, 0.4.1)
scruffy (0.2.2)
Selenium (1.0.1)
simple-rss (1.1)
sources (0.0.1)
sparklines (0.4.1, 0.2.7)
sqlite3-ruby (1.2.0, 1.1.0)
stomp (1.0.5, 1.0.4, 1.0.2)
streamlined_generator (0.0.6)
syntax (1.0.0)
tattle (1.0.1)
termios (0.9.4)
test-spec (0.3.0)
transaction-simple (1.4.0, 1.3.0)
trestle_generator (1.1.7.3, 1.1.2)
tzinfo (0.3.3, 0.2.1)
xml-simple (1.0.10)
ZenTest (3.4.3)

That's 73 gems, for those counting at home. Special notes: * even though streamlined_generator is still in there, it shouldn't be because we moved to a plugin model with 0.0.7 * the trestle generator is redundant if you have Rails 1.2 * there's a bunch of gems in there I've rarely used more than once, but only one designed to be that way