Dear Rogerio,

I bought Bascom 8051 in Feb 99 after consider to buy some other "C" and Basic compilers(including Keil, IAR, etc). You can get more info at www.mcselec.com.
The compiler produces very good code, it provides functions in order to work with LCD, I2C, Dallas 1 wire devices, SPI.....It includes a very good simulator all working under Windows.
You can embed assembler in basic code and can work with float number.
I think it is a must for fast developing and programming with 8051. And the most important, Mark Alberts (the programmer) gives a very good and fast support, even he consider any comment or suggestion in order to make the compiler better.

Hope this help
Fran Dominguez