pruttel you should never ever go online with out a firewall , its even worse if you have a constant internet connection ..all these are inbound connections , which means people are trying to connect to your computer and some of them are being allowed , if youre not downloading then i would be very concerned about this .. have you been downloading anything recently, that could explain some connections..
constant internet connections are prime targets for people to hijack , and with no firewall , you ll never see them , at least with protowall its blocking some of it, and there many internet viruses that can infect you just from being on the internet without proper protection..
i think u really need to invest in a good personal firewall as soon as you can , protowall is great for blocking ips , but its not going to fully protect you from hackers and trojans/viruses , at least not until it has port blocking .
so how have you verified that your computer is clean ?
do you have an anti-virus and is it updated ?
i would like to see a bit more of your logs , is it all the same inbound traffic, and i think you should get a virus scan just to make sure youre not infected..
http://housecall.trendmicro.com/