Deletes all of your reblogs only (hopefully).

tumbleed.py

USERNAME = 'your_username'
EMAIL = 'your@email.com'
PASSWORD = 'yourpassword'
import urllib as u
import urllib2 as u2
import re
from lxml import etree as e3
total = -1
del_ids = []
i = 0
while total < 0 or i * 20 < total:
  print 'Finding reblogs from post %d to %d...' % (i * 20, (i + 1) * 20 - 1)
  resp = u2.urlopen('http://%s.tumblr.com/api/read?start=%d' % (USERNAME, i * 20)).read()
  pxml = e3.fromstring(resp).getchildren()[1]
  if total < 0:
    total = int(pxml.attrib['total'])
  reblogs = 0
  posts = pxml.getchildren()
  for post in posts:
    post_str =  e3.tostring(post)
    if (len(re.findall('tumblr_blog', post_str)) == 0 # This is quite aggressive. 
        and len(re.findall('via-', post_str)) == 0): # For old reblogs. Quite dangerous.
      continue
    del_ids.append(post.attrib['id'])
    reblogs += 1
  i += 1
  print 'Found %d reblogs' % reblogs
print 'Deleting %d reblogs...' % len(del_ids)
for id in del_ids:
  data = u.urlencode({
    'email': EMAIL,
    'password': PASSWORD,
    'post-id': id,
    'generator': 'tumbleed'
  })
  print 'Post %s: %s' % (id, u2.urlopen('http://www.tumblr.com/api/delete', data).read())