Check out this recipe example
Spoiler:
class AdvancedUserRecipe1289760920(BasicNewsRecipe):
title = u'Ghacks'
oldest_article = 7
max_articles_per_feed = 100
summary_length = 100
use_embedded_content = False
no_stylesheets = True
remove_javascript = True
extra_css = '''
h1{font-family:Georgia,serif; font-weight:bold;font-size:large;}
h2{font-family:Georgia,serif; font-weight:normal;font-size:small;}
p{font-family:Georgia,serif;font-size:small;}
body{font-family:Georgia,serif;font-size:small;}
'''
remove_tags = [dict(name='div', attrs={'class':['navigation','alignright','sidebar3','sidebars','b asement clr','clr','socialize-in-content']}),
dict(name='div', attrs={'id':['breadcrumbs','respond',]}),
dict(name='ul', attrs={'class':['bottomnav','extendspost']}),
dict(name='ol', attrs={'class':['commentlist']}),
dict(name='p', attrs={'class':['tags']}),
dict(name='h3', attrs={'id':['comments']}),
dict(name='img'),]
feeds = [(u'Windows', u'http://www.ghacks.net/category/windows/feed/'), (u'Portable Apps', u'http://www.ghacks.net/tag/portable-software/feed/')]