v2.4.6 (for MC 1.4.6)
Keep forgetting to look into the font size thing, but I did find this mod. They've done the hit number thing way better than I have, so I recommend you guys check it out. The only downside is that it requires Forge.
If you want to use his numbers, then use the second download link (No add-on) to get just the main mod (chat messages) without the hit numbers.
This mod will spam your chat when your current tool is about to break, so that you can repair it and save materials. This mod does not require modloader, and it works in SSP as well as SMP.
The configuration file (durabilitywarning.txt) is fairly simple, here's the default file:
Tool types are pretty self-explanatory.
A false multiline will give you a 1-line warning instead of a 3-line warning.
Warnings! =D You can specify warning points (5, 75%) and warning ranges (10-5, 50%-40%). These must be separated by a comma. Spaces don't matter, they're ignored anyway.
Note: Since 2.2.5, add-on(s) will be packaged with the main mod.
NOTE: This mod does not, in any way, modify the durability of your tools. It is simply a warning system for those of us on auto-pilot when digging/mining/etc.