For those of you still mapping for HL1, I just had news from Adam Mckern informing me that the ZHLT 3.0 compile tools are going through their final Beta test.
You can expect to be able to get your hands on the Final version, hopefully, in the next few weeks.
Those of you designing levels for Source maps have good reason to be happy because once ZHLT 3.0 is finished, Adam will be concentrating on the Custom Source Tools.