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Only for Sendy 18.104.22.168 and 22.214.171.124:
The mod I had proposed for Sendy 126.96.36.199 (last december ) still works fine in Sendy 188.8.131.52: it allows to select the number of lines displayed in the "Last Opened" reports (instead of the default of 10).
Screenshot (above): http://dl.dropbox.com/u/406945/screenshot-sendy-184.108.40.206-report-hack.png
To install (Only for Sendy 220.127.116.11 and 18.104.22.168!!!): just replace report.php by this new one in your Sendy installation
Hope it can help!