You can always use your browser of choice -- they have a 'Save As' and you can choose 'As Text'. Something tells me this is not sufficient enough for you, however. The Perl Cookbook has a recipe devoted to converting HTML to ASCII. This is straight from the first edition, Recipe 20.5:

use HTML::FormatText;
use HTML::Parse;

$html = parse_htmlfile($filename);
$formatter = HTML::FormatText->new(leftmargin => 0, rightmargin => 50)
+;
$ascii = $formatter->format($html);
[download]

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)