Category talk:T30
The ThinkPad T30 is clearly specified as having a maximum memory of 1GB (2 x 512MB SO-DIMMs).
But I tried using 2GB (2 x 1GB SO-DIMMs) and it works just fine.
Here is my configuration: ThinkPad T30, model 2366-92U (1.8 GHz), BIOS Version 2.08 (1IET69WW), Embedded Controller Version 1.06
2 x Kingmax 1GB 200-Pin DDR SO-DIMM DDR333 (PC2700), Model # MSAD42D-KI
I bought them from Newegg.com, Item # N82E16820155111.
Other brands/models might also work; this is what I used and it works fine.