yet another RAM question...

I currently have Scrivener, Safari (three tabs) and TextExpander running on my Air, and I have 831 MB free out of 4GB RAM. Is this normal? I've posted some numbers below, the RAM stuff is at the bottom. I don't know how this stuff works and find it confusing


Hardware Information:
MacBook Air (13-inch, Mid 2011)
MacBook Air - model: MacBookAir4,2
1 1.8 GHz Intel Core i7 CPU: 2 cores
4 GB RAM

Startup Items:
tap - Path: /Library/StartupItems/tap
tun - Path: /Library/StartupItems/tun

System Software:
OS X 10.9 (13A603) - Uptime: 0 days 0:40:47

Disk Information:
APPLE SSD TS256C disk0 : (251 GB)
EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) /: 250.14 GB (84.13 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB


Kernel Extensions:
com.avatron.AVExVideo (1.7)
com.logmein.driver.LogMeInSoundDriver (1.0.2)
com.Cycling74.driver.Soundflower (1.5.2)
com.avatron.AVExFramebuffer (1.7)
foo.tap (1.0)
foo.tun (1.0)

Problem System Launch Daemons:

Problem System Launch Agents:

Launch Daemons:
[loaded] com.adobe.fpsaud.plist
[loaded] com.bombich.ccc.plist
[loaded] com.google.keystone.daemon.plist
[not loaded] com.logmein.logmeinblanker.plist
[not loaded] com.logmein.logmeinserver.plist
[loaded] com.logmein.raupdate.plist
[loaded] com.microsoft.office.licensing.helper.plist
[failed] com.splashtop.streamer-daemon.plist
[loaded] org.macosforge.xquartz.privileged_startx.plist

Launch Agents:
[loaded] com.citrix.AuthManager_Mac.plist
[loaded] com.citrix.ReceiverHelper.plist
[loaded] com.citrix.ServiceRecords.plist
[loaded] com.google.keystone.agent.plist
[loaded] com.logitech.manager.daemon.plist
[failed] com.logmein.LMILaunchAgentFixer.plist
[not loaded] com.logmein.logmeingui.plist
[not loaded] com.logmein.logmeinguiagent.plist
[not loaded] com.logmein.logmeinguiagentatlogin.plist
[not loaded] com.sony.ReaderDesktop.RunReaderDesktop.plist
[not loaded] com.splashtop.streamer-for-root.plist
[failed] com.splashtop.streamer-for-user.plist
[loaded] org.macosforge.xquartz.startx.plist

User Launch Agents:
[loaded] com.adobe.ARM.[...].plist
[failed] com.apple.CSConfigDotMacCert-hege.hermansen@me.com-SharedServices.Agent.plist
[failed] com.google.GoogleContactSyncAgent.plist
[loaded] com.spotify.webhelper.plist
[loaded] com.wondershare.mobilegodaemon.plist

User Login Items:
Default Folder X Helper
iSyncr
iTunesHelper
DEVONthink Personal Sorter
BetterTouchTool (215)
Alfred
BetterTouchTool
AdobeResourceSynchronizer
Google Drive
Dropbox
Jottacloud
DEVONthink Sorter
AirDisplayStatusItem
KiesAgent
ScreenCapture
readerAppHelper
TotalFinder
Wondershare Helper Compact
HazelHelper
Tags
KiesAgent
fuspredownloader

3rd Party Preference Panes:
Air Display Preferences
Citrix ShareFile Sync
Default Folder X
Flash Player
Growl
Hazel
Java
Logitech Preference Manager
MacFUSE (Tuxera)

Internet Plug-ins:
Default Browser.plugin
Flash Player.plugin
FlashPlayer-10.6.plugin
JavaAppletPlugin.plugin
QuickTime Plugin.plugin
SharePointBrowserPlugin.plugin
Silverlight.plugin

User Internet Plug-ins:

Bad Fonts:
None

Time Machine:
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 250.14 GB Disk used: 166.01 GB
Destinations:
TIME MACHIN [Local] (Last used)
Total size: 499.86 GB
Total number of backups: 36
Oldest backup: 2012-11-26 10:43:04 +0000
Last backup: 2013-11-08 19:32:47 +0000
Size of backup disk: Adequate
Backup size 499.86 GB > (Disk used 166.01 GB X 3)

Top Processes by CPU:
5% mdworker
3% WindowServer
2% EtreCheck
1% fontd
0% 2Do Helper
0% launchservicesd
0% warmd
0% mds
0% DEVONthink Sorter
0% coreservicesd

Top Processes by Memory:
168 MB com.apple.IconServicesAgent
147 MB mds_stores
119 MB Finder
98 MB Safari
94 MB Dropbox
90 MB WindowServer
57 MB GrowlHelperApp
57 MB Dock
45 MB Scrivener
41 MB com.apple.WebKit.WebContent

Virtual Memory Statistics:
831 MB Free RAM
1.32 GB Active RAM
682 MB Inactive RAM
1.00 GB Wired RAM
1.03 GB Page-ins
440 KB Page-outs

Great - thanks everyone.