I'm noticing a bunch of 0 Eth transactions spamming the EOS Crowdsale contract. They all seem to be coming from smart contracts that have already bid into a block. There's no telling if these are just badly written smart contracts or if there's some intentional effort to spam the EOS crowdsale. Thus far, the EOS ICO has really slowed down after raising ~$180m in the first days.
There hasn't been any announcements of network congestion yet but it's definitely something to keep an eye on if you're trading Eth or EOS. The contract can be viewed here: https://etherscan.io/address/0xd0a6e6c54dbc68db5db3a091b171a77407ff7ccf
