Just pointers so I don't forget.

• fastboot (http://android-dls.com/wiki/index.php?title=Fastboot and http://wiki.cyanogenmod.com/wiki/Fastboot)
• sbf_flash http://blog.opticaldelusion.org/search/label/sbf_flash;
  • This version (1.24) worked to flash the above stock image: sbf_flash

• http://www.android.net/forum/lg-ally-hacking-development/66078-2-2-1-easy-root.html, which uses psneuter from SuperOneClick (v.2.3.1) http://forum.xda-developers.com/showthread.php?t=803682

host$ unzip superoneclickv2.3.1-shortfuse.zip
[...]
host$ adb push Exploits/psneuter /data/local/tmp/psneuter
host$ adb shell
$ cd /data/local/tmp
$ chmod 0755 psneuter
$ ./psneuter # This will disconnect ADB
host$ adb shell
$ mount -o rw,remount /dev/block/stl9 /system
$ exit
host$ adb push Root/su-v2 /system/bin/su
host$ adb push Dependencies/busybox /system/bin/busybox
host$ adb push Dependencies/sqlite3 /system/bin/sqlite3
host$ adb push Root/Superuser.apk /system/app/Superuser.apk
host$ adb shell
$ cd /system/bin 
$ chmod 4755 su 
$ chmod 4755 busybox 
$ chmod 4755 sqlite3

• OpenRecovery: http://modmymobile.com/forums/563-motorola-milestone-roms/531599-open-recovery-v1-46-11-21-2010-a.html and source at https://gitorious.org/droid/openrecovery/;
• ClockWorkMod http://www.clockworkmod.com/rommanager/; 3.1.0.2 for Milestone at http://download2.clockworkmod.com/recoveries/recovery-clockwork-3.1.0.2-milestone.zip
• Stock images: http://sbf.droid-developers.org/; this one (from Optus) works: shols_u2_05.26.0_signed_ucashlsmr2emeab1b806e.0r_pds003_usams1fryooptuau_p010_a013_hwp2a_wig145203_1ff.sbf;
• Stock bootloaders: http://and-developers.com/boot:mbm (I initially had 90.74);
• Base umts_sholes build by Nadlabak: http://android.doshaska.net/cm9build or https://github.com/nadlabak;
• Various sbfs: http://download.peteralfonso.com/sholes
• ROM dumping http://www.modaco.com/topic/327661-how-to-backup-the-systemimg-bootimg-and-recoveryimg/; http://android.podtwo.com/romdump/
• Vulnerable 90.78 bootloader from http://android.doshaska.net/rootable

$ adb reboot bootloader # This will terminate when the phone reboots
$ sbf_flash vulnerable_recovery_only_RAMDLD90_78.sbf
SBF FLASH 1.24 (mbm)
http://opticaldelusion.org

=== vulnerable_recovery_only_RAMDLD90_78.sbf ===
00: RDL03 0x82000000-0x8204CFFF F125 AP
01:  CG47 0xB0EE0000-0xB12A07FF 679E AP

 !! Reboot phone into bootloader. Connected.
 >> uploading RDL03: 100.0%
 -- OK
 >> verifying ramloader
 -- OK
 >> executing ramloader
 -- OK
 >> waiting for phone: Connected.
 >> sending erase
 -- OK
 >> uploading CG47: 100.0%
 -- OK
 >> verifying CG47
 -- OK
 >> rebooting

(For some reason, the bootloader still says 90.74 afterwards; this might indicate that something failed…)

• MILEDROPEDIA http://www.droid-developers.org/
• Milestone reset: http://www.hardreset.eu/motorola_milestone_hard_reset_images_soft_reset_en.html
• Using Repo and Git: https://sites.google.com/a/android.com/opensource/download/using-repo
• Adding DuckDuckGo to the search engines: http://hoelz.ro/blog/adding-duckduckgo-as-an-android-browser-search-engine;
• Unbrick using .sbf: http://www.droidforums.net/forum/hacking-help/37717-unroot-unbrick-using-sbf-post-ikithme.html.
• adb reboot bootloader get the Milestone into fastboot mode, but

11:37 <@nadlabak> the fastboot mode on Milestone is of no use - no flashing, nothing

• Getting into the bootloader requires powering the phone up while pressing DPad-Up
• Sending commands to recovery:

11:41 <@nadlabak> echo "--update_package=SDCARD:update.zip" > /cache/recovery/command
11:42 <@nadlabak> to instruct the recovery to apply the update.zip from sdcard automatically

• Need to Help/Install New Software and install
  • CDT Plugins from http://download.eclipse.org/releases/juno (deactivating the blocking ones as instructed) (http://stackoverflow.com/questions/11419858/installing-adt-on-eclipse); or packaged under ArchLinux as community/eclipse-cdt
  • Developer Tools from https://dl-ssl.google.com/android/eclipse (http://www.techradar.com/news/phone-and-communications/mobile-phones/how-to-build-an-android-app-1046599)
• Need to edit the properties of the project, and in the Java Build Path/Libracies tab, add the JRE System Libraries and the relevant version of the android.jar from the prebuilt/sdk/ directory of the Android source tree.