Does anyone know of a method to do a replay gain adjustment on an entire library on an album by album basis as a batch job? I have 250o albums in FLAC format and dont want to do them one at a time.

I would use foobar2000 for this - simply put all the files in a playlist and replaygian as albums by tags.

[edit] Typo. [/edit]

Winamp can also do it.

To "do replay gain adjustments" sounds like you want do apply replay gain on your FLAC files. Don't do that! You should only scan your files and let foobar tag them with replay gain info.
It is OK to apply RG on convertion to a lossy format from your FLAC files though, because most DAP's ignores the RG tags on playback.

Foobar2000 is recommended over winamp for this because it is way faster, especially on dual cores.