I just can't get enough of these patches.  Here's another one I threw together tonight that implements PMTU detection for MTR:

                             My traceroute  [v0.72]
neodymium (0.0.0.0)                                    Thu May 15 01:17:41 2008
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                       Packets               Pings
 Host                                Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 90.66.42.1                        0.0%    16    0.2   0.3   0.2   0.5   0.1
 2. 90.66.43.4 [PMTU: 1446]           0.0%    15    2.2   1.6   1.5   2.2   0.2
 3. 99.50.161.222                     0.0%    15   79.9  79.8  79.5  80.1   0.2
 4. 90.42.7.1                         0.0%    15   81.1  81.1  80.7  82.2   0.4
 5. 90.27.15.2                        0.0%    15   81.8  81.6  81.4  82.2   0.2
 6. 90.27.118.188                     0.0%    15   83.2  83.6  83.2  84.2   0.3

More information here, as always.

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