Add links to some LWN articles, and then some.

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+[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+
+# Existing
+
+We have debugging infrastructure.  For example:
+
+  * [[GDB]]
+
+  * [[GNU Mach debugging|microkernel/mach/gnumach/debugging]]
+
+  * [[GNU Hurd debugging|hurd/debugging]], including
+    [[hurd/debugging/rpctrace]] and more.
+
+
+# To Do
+
+  * [[ltrace]]
+
+  * [[latrace]]
+
+  * [[profiling]]
+
+  * *[Checkpoint/restart](http://lwn.net/Articles/412749/) allows the state of
+    a set of processes to be saved to persistent storage, then restarted at
+    some future time* -- quoting from Jonathan Corbet's 2010 Linux Kernel
+    Summit report.
+
+    This is surely a very useful facility to have for reproducing failures, for
+    example.  But on the other hand it's questionable how it can help with
+    debugging failures in [[GNU Hurd server|hurd/translator]]s' interactions,
+    as their state is typically spread between several processes.
+
+  * [[locking]]