I like PasswordPilot. You enter you app store password in it, and when you conduct a xaction, you get a popup with your log in info; push ok. I think there's a tweak out there that skips the ok part; just logs you in.
that clock widget came with the intelliscreenX. Go to cydia and install it to try out, it has many features like Facebook, tweeter, emails, news, quick sms compose, reply on your lock screen. When i purchase it, it was $9,99 i don't know if the price increase again or not. And yes it's a lot expensive for such a tweak, i had not choice than buying it as i need it.
I love IntelliScreenXD.... but it eats my battery at olympic-super hero speeds. It's a shame, as I really like it. I bought LockInfo AND Intelliscreen so I could see which one was better. I actually think I prefer the layout of Intelliscreen, but it eats battery like crazy! So LockInfo is the one for me - and it's pretty good