Need help interpreting bleak house output

Hello! I haven't been able to find much on how to interpret the output from bleak house. I got this after exercising my app for a little while. Does anybody see anything suspicious?

342727 total objects Final heap size 342727 filled, 410045 free Displaying top 20 most common line/class pairs 257845 __null__:__null__:__node__   27971 __null__:__null__:String    2160 /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/ helpers/asset_tag_helper.rb:449:String    1930 (eval):3:String    1089 /usr/lib/ruby/gems/1.8/specifications/actionpack-2.0.2.gemspec: 15:String    1045 /usr/lib/ruby/1.8/yaml.rb:133:String     987 /usr/lib/ruby/gems/1.8/specifications/ actionpack-1.13.6.gemspec:13:String     981 /usr/lib/ruby/gems/1.8/specifications/ actionpack-1.13.3.gemspec:13:String     945 /usr/lib/ruby/gems/1.8/specifications/ activerecord-2.0.2.gemspec:15:String     927 /usr/lib/ruby/gems/1.8/specifications/ activerecord-1.15.6.gemspec:13:String     915 /usr/lib/ruby/gems/1.8/specifications/ activerecord-1.15.3.gemspec:13:String     909 __null__:__null__:Regexp     807 /usr/lib/ruby/gems/1.8/specifications/rubygems- update-1.1.1.gemspec:15:String     735 /usr/lib/ruby/gems/1.8/specifications/net-ssh-1.1.2.gemspec: 15:String     727 __null__:__null__:Class     720 /usr/lib/ruby/gems/1.8/specifications/rails-2.0.2.gemspec: 14:String     654 /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active_record/attribute_methods.rb:160:__node__     605 /usr/local/lib/site_ruby/1.8/rubygems/specification.rb: 557:Array     576 /usr/lib/ruby/gems/1.8/specifications/rubygems- update-1.0.1.gemspec:15:String     538 /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/core_ext/module/introspection.rb:31:String

Basically, my two mongrels use about 40MB each when started, and after a day or two, they grow to almost 200MB. The main function of the site is to display items (www.massstreetmusic.com), and there are around 2500 items with a few pictures each (and yes, I've gotten rid of RMagick). Maybe this usage is normal for a site of this size and traffic (around 5,000 page views per day), but I'd appreciate the opinion of others.

Thanks!

-Kyle

Hop into #fauna on Freenode IRC. The author of Bleahouse, Evan Weaver (evn), can help you out.

--Jeremy