It’s a minimalistic and therefore very efficient piece of software. The program stores its data in a handy sqlite database. There is a timestamp and a line of description for every pomodoro in this database. The following sql query, which you can enter into a terminal window will show the contents of the database:
echo "select datetime(ZWHEN, 'unixepoch', '+31 years'),ZNAME from zpomodoros;"|sqlite3 $HOME/Library/Application\ Support/Pomodoro/Pomodoro.sql
The output could be like this:
2010-02-03 13:29:58|$CUSTOMER $PROJECT Todos
2010-02-03 14:06:18|$CUSTOMER $PROJECT Todos
2010-02-03 15:12:57|$CUSTOMER $PROJECT Todos
2010-02-03 15:43:12|$CUSTOMER $PROJECT Image kopieren
2010-02-03 16:28:31|Planung Inhalte Seminar JuF
2010-02-03 17:09:09|Planung Inhalte Seminar JuF
2010-02-04 13:15:35|$CUSTOMER: Arbeiten am Image
2010-02-04 13:45:52|$CUSTOMER: Arbeiten am Image
2010-02-04 14:16:15|$CUSTOMER: Arbeiten am Image
2010-02-04 14:46:36|$CUSTOMER: Arbeiten am Image
2010-02-07 07:12:03|Inbox: E-Mails bearbeiten
A friend an I wrote a little Applescript program, which exports the pomodoro data into an ics-file on your Desktop.
This file can be imported into iCal:

With this dialog you can choose wether to create a new calendar or to import the data into an existing one. After that, you can see the entries in iCal:

Please download the zip archive from here. Double-click the archive to extract the program and move it at a convenient place in your file system.
Have fun!