Google Play Store v3.5.16 just started rolling out. If you want to grab it sooner, AndroidPolice has provided some download links. This update is designed to provide a fix for those having trouble seeing purchased apps or experiencing force closes. Some folks also claimed that it feels smoother and snappier. Here are the download instructions and links:
Source: AndroidPoliceDownload (change the extension to .apk if your browser downloads it as something else for some reason, like a .zip or .bin) and install as you would do it with any other apk - it will replace the existing Market or Play Store with the latest version 3.5.16.