I cant find good examples and help in Internet for seesaw gem. Maybe it is used only by very experirienced rails persons.

I will publish my configurations in case they are helpfull to some one.

guda@guda-desktop:~/system3/config$ cat seesaw.yml 
restart_cmd: sudo kill -HUP `cat /usr/local/nginx/logs/nginx.pid`
config_symlink: http_cluster/cluster.conf
mongrel_config_path: /home/mongrel/system3/current/config/mongrel_cluster.yml
config_path: /home/mongrel/system3/current/config
  all: cluster_all.conf
  1: cluster_1.conf
  2: cluster_2.conf
symlink_cmd: ln -sf

here is where my nginx conf link points

guda@guda-desktop:~/system3/config/http_cluster$ ls -l
total 16
-rw-r--r-- 1 guda guda 152 2008-11-07 17:17 cluster_1.conf
-rw-r--r-- 1 guda guda 152 2008-11-07 17:17 cluster_2.conf
-rw-r--r-- 1 guda guda 277 2008-11-07 17:17 cluster_all.conf
lrwxrwxrwx 1 guda guda  66 2008-11-08 01:30 cluster.conf -> /home/mongrel/system3/current/config/http_cluster/cluster_all.conf

and in deploy.rb I have this task rewritten.

set :seesaw_conf, "#{current_path}/config/seesaw.yml"
namespace :deploy do
  desc <<-DESC
  Restart the Mongrel processes on the app server using seesaw
  task :restart, :roles => :app do
    run <<-CMD
      cd #{current_path} ; #{mongrel_rails} seesaw::bounce -C #{seesaw_conf}
#    send(run_method, "cd #{current_path}; #{mongrel_rails} seesaw::bounce -C #{seesaw_conf}")

I am not sure that this is the perfect way of configurating the seesaw. I think that I have some mistakes in the path configurations, and because of that I have to patch the capistrano restart task.