hi
i know eac & cdex are better then audiograbber, but often i use audiograbber and lame 3.90.3(preset extreme) to encode my cds

but i notice the lame give me a wrong lenght , and i have to correct with foobar! why?

1. Have you noticed skips or "sh" noises? If not, good for you. Most newer drives given them w/o paranoid or secure mode (found this out the hard way). If these don't occur with the ripping options from AG, you may be fine--my now dead drive gave perfect, if not speedy, results with buffered burst copy, but newer ones I was able to use only get things right w/ EAC secure mode.
2. Do you have it set to encode as it rips? If so, that may be the problem. I don't know what happens, but with 3.90.3 and 3.96 (haven't tried 3.96.1 yet), I got file lengths that were based on the first frame's bitrate * frames (from all I could tell, anyway). Setting it to rip a track, then encode a track fixed it, though added time, of course. This occured with the DLL and EXE.
Also, you can use Foobar's fix MP3 header feature for those you've already ripped.

Try turning off ID3 tags in AudioGrabber - tag the MP3's manually or with a program such as MP3 Tag Studio after encoding.