The BASIC interpreter eats up around 600 bytes in the Arduino RAM, leaving about 1.4 kB for BASIC code. Not much, but more than the lowest-end BASIC Stamp.

Eclipse based Arduino development uses two additions to the basic Eclipse IDE. One is the C/C++ Development Tooling (CDT).

Check out the this colourful but BASIC use of Arduino, flagged in the "Tweets of the Week" section of the magazine, but it's worth highlighting in a bit more detail.