[Azure Haights]

Couple suggestions.

First, I don't know what version of Winamp you're using to get *any* centiseconds (man that word looks weird), but Audacity works wonders here in that (a) you have the time displayed with more precision than just seconds (milliseconds, even) and (b) you can go right to the beginning of the line instead of guessing. Also, you can add a label track when you open up your mp3 and add a label at each line, then export the labels and have them all in one file already. Then you just have to add the [] around each time and cut-and-paste the lines in. (or take your lyrics and cut-and-paste the times in)

The label-export method works wonders for tepples' times2bpm manual tempo finder too. </shameless plug> Plus, Audacity is a good free quick-and-dirty audio editor, so you could theoretically cut the song, get the offset/gap, time the lyrics and get the tempo all with the same program. (Plus notepad, of course. And go ahead and use an automatic BPM finder if you know the song uses a constant BPM.)

Second, another lyric site I just found - lyricwiki.org. It's a wiki, of course (think Wikipedia), so take that with as many grains of salt as you wish. (Personally, I think wikis get a bad rap.)

Third, I remember reading somewhere that, at least for SM lrc files, you should cut 3 tenths (30 centiseconds, 300 milliseconds) off of any vocal line, just because of the way SM displays lyrics. If you're only using Winamp, though, it shouldn't be too necessary since your margin of error may fall outside that shift anyways.