No one is responsible for what YOU do with YOUR phone. Any software modification to technology carries with it a certain risk of permanent damage, when you modify your device you accept this as your own responsibility.
XDA specific stuff:
Useful information/posting rules
XDA Developers Android application
Useful software (PC)
Easy root - nbetcher
AlphaRev - Gain S-OFF on your Slide!
ADB - The Android Debug Bridge. A collection of tools that any rooted Android user should have. ADB allows one to interact with their device from a terminal interface. This enables the user to do a variety of tasks such as sideloading applications and more.
Android - A Linux based operating system created and mostly designed by Google. The major revisions are 1.0, 1.1, 1.5 (Cupcake), 1.6 (Donut), 2.0/2.0.1/2.1 (Eclair), 2.2 (Froyo) 2.3 (Gingerbread), and 3.0 (Honeycomb - tablet only). The majority of Android major revisions are named after desserts.
APK - Android PacKage. These are, basically, Android applications and all of their data. They are run via the Dalvik Virtual Machine on your device.
Bootloader - The part of a computer that loads the operating system. If this is damaged/deleted you are screwed.
Flashing - The act of installing a ROM onto an embedded device or emulator.
Overclocking - Increasing the "clock" of a processor to increase its speed at the expense of battery life and possibly your phone. Not all processors overclock the same, even if the hardware is identical. One phone with a Hummingbird SoC will not be able to overclock to 1.2ghz, yet another would be able to overclock to 2.0ghz (very unlikely).
S-ON/S-OFF - S-ON is a "security" measure put in place by HTC on their newer phones that read locks /system and /recovery. Switching S-ON to S-OFF disables this protection and allows you to replace the stock recovery, and modify /system while the phone is in Android.
Radio/Modem - The parts of a firmware that allow communication between the operating system, the telecommunication hardware, and a mobile network. Some radios give good battery life, some good signal, some neither.
XDA - This site, XDA is a community of likeminded developers, hackers, and users who modify various phones running various operating systems (Windows Mobile, Windows Phone 7, and Android specifically).
These ROMs are based on Android 2.3 "Gingerbread," the latest version of Google's Android OS (as of 1/21/2011).
These are ROMs that are based on Android 2.2 "Froyo". Froyo introduced the JIT compiler, bringing with it major speed boosts in both benchmarks and practice.
CM6 clones, themes, WinZips, etc
Wired CM MOD
SLIDE MR1 v4
Stock bloatless/themed Sense
CHARGIN' UP MAH WINZIP
MMModded CR_Mod - MusicMan374
Legend to Slide
Aria2Slide BETA 2
CyanogenMOD 5 - Warning, alpha as JEBUS
#TeamSlide Senseless v39
Kanged CM 5.0.8
Even more kanged CM 5.0.8!
These CWM flashable zips allow you to change kernels. OC kernels allow you to overclock and UV kernels undervolt your processor.
Unnamed Kernel - OC/smartass governor - migueltherocker (aka: MANUEL!)
dumfuq's "dopio" - OC/cm-22.214.171.124
These CWM flashable zips allow you to pick and choose the radio revision you wish to use together with your ROM.
126.96.36.199 - Latest!
7.09.35.10 - First OTA's
7.03.35.14 - stock
Radio hosting and reference - reukiodo
Radio extraction and original uploading - ChiefzReloaded
S-OFF - The AlphaRev guys
Original root method - Eugene_373
Latest and greatest root method - nbetcher
Original keyboard fix - brandini
CyanogenMOD - #TeamDouche et al
Another root method
Custom MTD partitions
Wifi fix (CM6)
data2ext for CM7
Beautiful Widgets - A collection of toggles, weather, clock, and other widgets. Many themes are available and the suite is very customizable. Paid.
Fancy Widget - A great clock and weather widget. Fancy has a multitude of settings and customization options. Free.
Minimalistic Text - A great widget set for those who enjoy having a very minimalistic looking device. Can be configured to show time, weather, battery, and date.
Solar Wind live wallpaper
Matrix live wallpaper
Snowfall live wallpaper
Android Music - Gingerbread music app for >1.6
Metro UI - Windows Phone 7 on your Slide, ish!
Handcent SMS - A great little SMS replacement that allows you to customize almost everything.